Area Code 458: Cities, Coverage, and Regulations

Area code 458 is an Oregon telephone area code that serves Eugene, Bend, Medford, and most of the state outside Portland. This complete guide covers 458 area code cities, coverage map, dialing rules, the overlay with 541, time zones, and technical integration for developers building telephony applications.

Why Does Area Code 458 Matter for Developers?

Understanding area codes is essential when building applications that handle phone numbers. Correctly identify and process area codes to ensure accurate routing, validation, and seamless communication. This matters for:

• Call routing and forwarding: Direct calls to the correct destination based on area code
• Phone number validation: Ensure user-provided phone numbers are valid and correctly formatted
• SMS messaging: Send text messages to users within specific area codes
• Location-based services: Provide services based on a user's area code
• Emergency services integration: Accurately route emergency calls based on location
• Compliance: Meet TCPA regulations for automated calls and texts

Common Developer Errors and Edge Cases

Handle area code specifics correctly to avoid critical issues. Common errors include:

• 7-digit dialing assumption: In overlay areas like 458/541, 7-digit dialing fails. All calls require 10-digit dialing (458-XXX-XXXX), even for local calls.
• Invalid exchange codes: The NXX (exchange) must follow NANP rules: first digit 2-9, second digit 0-9, third digit 0-9. The last two digits cannot both be 1 (e.g., 458-211-XXXX is invalid).
• International format handling: Not supporting E.164 format (+1-458-XXX-XXXX) causes issues with international users and modern APIs.
• Database storage errors: Storing numbers with inconsistent formatting (with/without country code, different separators) creates portability and querying problems.
• Reserved number ranges: Special codes like 976 (premium services) and 555-01XX (reserved for fictional use) require special handling.

Cost and Compliance: SMS and voice calls to area code 458 bill at standard US domestic rates. Validation failures waste API calls, cause delivery failures, and risk TCPA compliance violations if automated calls reach wrong numbers.

Where is Area Code 458 Located? Oregon Coverage Map

Area Code 458 serves Oregon as an overlay with Area Code 541 – both codes cover identical geographic territory. This overlay launched on February 10, 2010 to address projected number exhaustion in the 541 area code without forcing existing customers to change their numbers.

Oregon area code 458 coverage: Area codes 458/541 cover all of Oregon except the northwestern corner (Portland metro area), which uses area codes 503/971. The coverage area spans from the Pacific Coast to the Idaho border, excluding only the Portland-Salem region. Specifically:

• Included: Eugene, Springfield, Corvallis, Albany, Grants Pass, Medford, Bend, Ashland, Klamath Falls, The Dalles, Burns, Lakeview, Pendleton, and the entire coastal region from Lincoln County to the California border
• Excluded: Portland, Salem, and surrounding northwestern metropolitan areas (served by 503/971 area codes)

Time zones: Most of the 458/541 service area uses Pacific Time Zone (UTC-8/UTC-7). However, portions of eastern Oregon, including Malheur County (Ontario area), observe Mountain Time Zone (UTC-7/UTC-6).

Oregon Area Code Comparison

What Cities Use Area Code 458 in Oregon?

Area code 458 serves 26-28 counties and covers approximately 110 major cities and communities across Oregon. The 458 area code includes these major population centers:

• Eugene (Lane County): Oregon's second-largest city with approximately 177,000 residents. Home to University of Oregon.
• Bend (Deschutes County): Central Oregon's largest city with approximately 100,000 residents. Major outdoor recreation hub.
• Medford (Jackson County): Southern Oregon's largest city with approximately 85,000 residents. Regional healthcare and commerce center.
• Springfield (Lane County): Adjacent to Eugene, approximately 63,000 residents.
• Corvallis (Benton County): Home to Oregon State University, approximately 59,000 residents. Technology sector hub.
• Albany (Linn County): Approximately 56,000 residents. Historic Willamette Valley city.

Complete county coverage (28 counties): Baker, Benton, Coos, Crook, Curry, Deschutes, Douglas, Gilliam, Grant, Harney, Hood River, Jackson, Jefferson, Josephine, Klamath, Lake, Lane, Lincoln, Linn, Malheur, Morrow, Sherman, Umatilla, Union, Wallowa, Wasco, Wheeler, and portions of Marion County.

LATA divisions: The numbering plan area is divided among four Local Access and Transport Areas:

• Portland LATA: Most of the coverage area
• Eugene LATA: Southwest portion
• Boise/Southern Idaho LATA: Malheur County (eastern Oregon border)
• Spokane LATA: Part of northeast Oregon

Geographic and Demographic Insights

Oregon's diverse landscape presents unique telecommunications challenges. The 458/541 service area encompasses:

• Coastal regions: Lincoln, Coos, and Curry counties along the Pacific Ocean
• Willamette Valley: Eugene, Corvallis, Albany (moderate population density)
• Cascade Range: Mountainous terrain with scattered communities
• Central Oregon: High desert plateau around Bend
• Eastern Oregon: Sparse rural areas with significant distances between towns

Infrastructure considerations for developers:

• Rural areas may have limited cellular coverage, affecting SMS delivery rates
• Mountainous terrain can impact signal strength and latency
• Population density varies from 177,000 (Eugene metro) to towns under 1,000 residents
• Network performance varies significantly by carrier and location

Area Code 458 Dialing Rules and Regulations

Area Code 458 operates under the jurisdiction of federal and state regulatory bodies:

• Federal Communications Commission (FCC): Administers the North American Numbering Plan (NANP), establishes number pooling requirements, and enforces compliance with telemarketing regulations.
• Oregon Public Utility Commission (OPUC): Regulates telecommunications utilities within Oregon, including area code relief planning and consumer protection.

Key regulatory timeline:

• November 5, 1995: Area code 541 split from 503 to serve all Oregon outside Portland/Salem
• 2007: Number exhaustion projections trigger overlay planning for 541
• July 2009: 10-digit dialing phased in (permissive period begins)
• January 2010: 10-digit dialing becomes mandatory
• February 10, 2010: Area code 458 activated as 346th NANP area code
• August 2011: First 458 exchange (205) issued in Eugene

Compliance requirements for developers:

• Implement mandatory 10-digit dialing for all calls within 458/541
• Support E.164 international format (+1-458-XXX-XXXX)
• Comply with TCPA regulations for automated calling and texting
• Implement proper caller ID display (CNAM) standards
• Support Local Number Portability (LNP) – users can keep numbers when changing carriers

Dialing Procedures: A Guide for Your Applications

Implement these dialing rules:

• Local calls (within 458/541): Dial full 10-digit number: 458-XXX-XXXX (7-digit dialing is not supported)
• Long-distance calls (different area code): Dial 1-458-XXX-XXXX
• International calls to 458: Dial +1-458-XXX-XXXX (E.164 format)
• Operator assistance: Dial 0-458-XXX-XXXX
• Premium services (976 prefix): Must dial 1-458-976-XXXX (special billing applies)

Implementation example (validation logic):

Valid formats to accept: - 4585551234 (10 digits) - 458-555-1234 (formatted) - (458) 555-1234 (formatted) - +14585551234 (E.164) - 1-458-555-1234 (long-distance) Invalid inputs to reject: - 555-1234 (7 digits - incomplete) - 458-211-1234 (exchange ending in 11) - 458-155-1234 (exchange starting with 0 or 1) - 458-555-0100 (reserved for fictional use)

Common dialing errors and troubleshooting:

• Call fails with "not a valid number": User likely attempted 7-digit dialing. Prompt for full 10-digit number.
• International calls fail: Verify E.164 format with country code (+1).
• Premium service calls blocked: Some carriers require explicit user consent for 976 numbers.

Telecommunications Infrastructure and Number Availability

The 458/541 service area has robust telecommunications infrastructure:

Major carriers operating in area code 458:

• Verizon Wireless: Primary carrier, extensive LTE/5G coverage in urban areas
• AT&T: Strong coverage in cities, variable rural coverage
• T-Mobile: Good urban coverage, expanding rural network
• Regional carriers: Local providers serving specific counties

Number availability and provisioning:

• As of 2025, area code 458 uses 207 active prefixes out of 800 possible (26% utilization)
• Area code 541 has higher utilization but remains available
• New number provisioning typically takes 1-3 business days
• Number porting between carriers: FCC mandates completion within 1 business day for simple ports

For developers implementing number provisioning:

• Use carrier APIs (Twilio, Bandwidth, etc.) for programmatic number acquisition
• Expect standard US domestic pricing for 458 numbers
• Local numbers typically cost $1-2/month through wholesale providers
• Toll-free alternatives (800/888/etc.) available if local presence not required

Understanding 458 Number Allocation: Thousands-Block Pooling

The thousands-block number pooling system, implemented by the FCC in 2000 and rolled out nationally in 2002, significantly changed number allocation:

Traditional system (pre-2000):

• Carriers received entire NXX codes (10,000 numbers: 458-555-0000 through 458-555-9999)
• This led to inefficient use and rapid number exhaustion

Current pooling system (post-2002):

• The FCC splits each NXX into ten blocks of 1,000 numbers
• Example: 458-555-0XXX, 458-555-1XXX, 458-555-2XXX (each block allocated separately)
• A designated Pooling Administrator manages blocks under FCC oversight
• Allocation occurs within rate centers (geographic areas for billing)

Rate centers in area code 458:

A rate center is a geographic designation that determines local calling boundaries. Examples in 458 include:

• Eugene rate center: serves Eugene and Springfield
• Bend rate center: serves Bend and surrounding areas
• Medford rate center: serves Medford, Central Point, Phoenix, and Talent

Impact on developers:

• Numbers from the same NXX may be allocated to different carriers
• Number lookup APIs should query actual carrier assignment, not assume by prefix
• Thousands-block pooling extends area code lifespan significantly
• Current projections: 458/541 overlay sufficient through at least 2040

Area Code 458 Developer Integration Guide

Successfully handling area code 458 requires attention to:

Essential implementation checklist:

1. ✓ Enforce 10-digit dialing (never accept 7-digit input)
2. ✓ Validate NXX format (first digit 2-9, not ending in 11)
3. ✓ Store numbers in E.164 format (+14585551234)
4. ✓ Support both 458 and 541 in the same service area
5. ✓ Handle Pacific and Mountain time zones correctly
6. ✓ Implement proper error messages for invalid formats
7. ✓ Use carrier lookup APIs for accurate routing
8. ✓ Comply with TCPA regulations for automated communications

Recommended tools and libraries:

• Google libphonenumber: Comprehensive phone number parsing and validation
• Twilio Lookup API: Real-time number validation and carrier identification
• Regex validation: ^\+?1?(458)[2-9]\d{2}(?<!11)\d{4}$

Next steps:

• Review FCC numbering resources
• Check NANPA area code information
• Test your implementation with both 458 and 541 numbers

Frequently Asked Questions About Area Code 458

What is the 458 area code overlay with 541?

An overlay means 458 shares the same geographic area as area code 541. Launched February 10, 2010, this approach addressed number exhaustion without forcing existing 541 customers to change their numbers. The overlay requires mandatory 10-digit dialing for all calls because the network cannot determine which area code to route to with only 7 digits.

How does the thousands-block pooling system impact developers?

The FCC-mandated thousands-block pooling system allocates numbers in blocks of 1,000 (rather than 10,000), promoting efficient resource utilization. For developers:

• Numbers from the same NXX prefix may belong to different carriers
• Number lookup APIs are essential for accurate carrier identification
• Pooling significantly extends area code lifespan
• Rate centers determine which blocks are available in each geographic area

Why is 10-digit dialing mandatory for local calls within Area Code 458?

In overlay areas (458/541), the telephone network cannot determine the correct area code from a 7-digit number because both codes serve the same geography. Mandatory 10-digit dialing (458-XXX-XXXX) completes calls, even local calls. This became mandatory in January 2010, enforced by all carriers.

When did area code 458 start in Oregon?

Timeline:

• July 2009: 10-digit dialing permissive period began
• January 2010: 10-digit dialing became mandatory
• February 10, 2010: Area code 458 officially activated (346th NANP area code, Oregon's fourth)
• August 2011: First 458 exchange (205) issued in Eugene

Is 458 the same as 541 area code?

No geographic difference – both codes cover identical territory (all Oregon except Portland/Salem metro). Key distinctions:

• 541: Original area code, split from 503 in 1995
• 458: Overlay added in 2010 to address 541 number exhaustion
• Existing numbers: Kept their 541 assignments
• New numbers: Assigned from either 458 or 541 based on availability and carrier
• Both codes have equal status and identical regulatory treatment

Which major cities use Area Code 458?

Major cities include:

• Eugene (Lane County): ~177,000 population
• Bend (Deschutes County): ~100,000 population
• Medford (Jackson County): ~85,000 population
• Springfield (Lane County): ~63,000 population
• Corvallis (Benton County): ~59,000 population
• Albany (Linn County): ~56,000 population

Also serves: Grants Pass, Ashland, Klamath Falls, The Dalles, Pendleton, Burns, Lakeview, Hood River, Hermiston, La Grande, and 100+ smaller cities across 26-28 counties.

How do you validate Area Code 458 phone numbers in applications?

Validation rules (NANP format):

• Format: 458-NXX-XXXX where N=2-9, X=0-9
• Total digits: 10 (excluding country code)
• First digit of NXX: Must be 2-9 (not 0 or 1)
• Last two digits of NXX: Cannot both be 1 (e.g., 458-211-XXXX invalid)
• E.164 format: +1-458-NXX-XXXX (international standard)

Recommended validation approach:

1. Use libphonenumber library (supports all NANP rules) 2. Validate format: ^\+?1?(458)[2-9]\d{2}(?<!11)\d{4}$ 3. Check against reserved ranges: - 458-555-0100 through 458-555-0199 (fictional use) - 458-976-XXXX (premium services, special billing) 4. Use carrier lookup API for deliverability verification 5. Normalize to E.164 (+14585551234) before storage

Edge cases to handle:

• User inputs 7 digits: Reject with "Full 10-digit number required"
• Invalid NXX (e.g., 458-155-1234): Reject with "Invalid exchange code"
• Missing country code for international: Add +1 prefix
• Reserved numbers: Flag for special handling or rejection

What is the proper phone number format for Area Code 458?

Display formats (for user interfaces):

• (458) 555-1234 – Standard US format with parentheses
• 458-555-1234 – Simple hyphenated format
• 458.555.1234 – Dot-separated format (less common)

Storage format (for databases):

• +14585551234 – E.164 format (recommended)
• Benefits: International compatibility, consistent parsing, portability

Input format (accept flexibly, validate strictly):

Accept: 4585551234, 458-555-1234, (458) 555-1234, +1-458-555-1234 Normalize all to E.164: +14585551234

API formats by provider:

• Twilio: Requires E.164 format (+14585551234)
• Bandwidth: Accepts E.164 or 10-digit (4585551234)
• Most modern APIs: Prefer or require E.164

Which carriers operate in Area Code 458?

Major national carriers:

• Verizon: Extensive coverage, strongest in urban areas
• AT&T: Good urban coverage, variable rural service
• T-Mobile: Urban-focused, expanding rural network
• Sprint (now T-Mobile): Merged network coverage

Regional and local carriers:

• CenturyLink/Lumen (legacy landline provider)
• Frontier Communications (rural areas)
• Various small regional carriers serving specific counties

For developers:

• Use carrier lookup APIs (Twilio Lookup, Neustar, etc.) to identify the actual carrier
• Don't assume carrier by area code or prefix (number pooling means mixed allocation)
• Respect carrier-specific delivery requirements for SMS/MMS
• Test message delivery across multiple carriers

Does Area Code 458 still have available phone numbers?

Yes, significant availability remains.

• Current utilization: ~207 of 800 possible NXX codes assigned (26%) as of 2025
• Introduction date: February 2010 (15 years of gradual adoption)
• Exhaustion forecast: Not projected before 2040 given current growth rates
• Comparison: Area code 541 has higher utilization but also remains available

Factors extending lifespan:

• Thousands-block pooling (efficient allocation since 2002)
• Overlay design (doubled capacity without geographic split)
• Mobile number portability (users keep numbers when moving)
• VoIP and virtual numbers (reduce demand for new assignments)

For developers provisioning numbers:

• Both 458 and 541 prefixes readily available
• No premium pricing for 458 vs 541
• Standard provisioning timelines (1-3 business days)

For further information, refer to the FCC Numbering Resources, Oregon Public Utility Commission, and North American Numbering Plan Administration.