Area Code Lookup
Lookup NANP area codes by code, phone number, city, state, or province with status, overlays, dialing plans, and caller-location caveats.| {{ heading }} | Copy |
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North American area codes are numbering-plan assignments, not live location trackers.
The North American Numbering Plan (NANP) uses country code +1 and a ten-digit domestic number structure. The first three digits after +1 are the Numbering Plan Area, or NPA, commonly called the area code. An area code can point to a state, province, territory, overlay group, or service category such as toll-free calling.
Area-code lookup is useful when a phone number, support ticket, lead list, call log, or routing note needs quick assignment context. A code can show whether the number belongs to an in-service geographic area, a planned or reserved code, a non-geographic service range, or an overlay complex that shares the same region with other codes.
A major limit matters here. An area code identifies numbering assignment context, not the caller's current position. Mobile numbers, voice-over-IP lines, forwarded calls, number portability, and caller ID spoofing can make a familiar local-looking number come from somewhere else.
How to Use This Tool:
Start with the clue you have, then widen or narrow the records depending on whether you are checking an active caller, a planning note, or a service code.
- Enter a three-digit area code, a ten-digit NANP phone number, a +1 phone number, a city, a U.S. state code, a Canadian province name, or another visible location phrase.
- Choose the search scope. Current assigned codes are best for ordinary call context, current geographic only removes non-geographic services, and all NANP records includes available, reserved, planned, and special-use codes.
- Use the country or service filter when you only want United States, Canada, Caribbean and Atlantic, or non-geographic service matches.
- Leave reference city aliases on when a city clue matters. Turn them off when you want the search to rely on official area-code fields rather than supplemental city and coordinate hints.
- Open the Code Snapshot first for the selected code's status, use, location, country, time zone, overlay complex, parent code, assignment dates, planning letters, relief flag, and jeopardy flag.
- Use Match Ledger for a filtered list, Dial Plan for 7D, 10D, and 1+10D dialing notes, Reference Plot for available approximate coordinate points, Source Notes for coverage caveats, and JSON when you need a structured handoff.
- If the summary says no match, check whether the entry is outside the NANP, misspelled, too long to be a code, or excluded by the current scope or service filter.
Interpreting Results:
The status badge deserves the first look. In service means the code is assigned and active. Assigned, not in service, reserved, available, or not assigned should not be treated as ordinary caller context unless you are checking numbering plans rather than a real call.
Location, country, reference city, and time zone describe numbering assignment. They can help route support cases or clean a lead list, but they do not prove where a person or device is now. Treat caller ID, especially local-looking caller ID, as a weak clue unless another source confirms the caller.
Overlay complex changes dialing expectations. When two or more area codes share the same geographic area, local dialing often requires the area code even when the call stays local. The Dial Plan rows show whether home and foreign NPA calls are listed as 7D, 10D, 1+10D, or not applicable.
Reference Plot points are approximate. Use them to see broad match distribution, not coverage boundaries, rate centers, emergency-service jurisdiction, or exact customer location.
Technical Details:
NANP numbers follow the NPA-NXX-XXXX pattern. NPA is the three-digit area code. NXX is the central office code, also called the exchange or prefix. In the formal notation, N is any digit from 2 through 9 and X is any digit from 0 through 9. The complete number is tied to country code +1, which is shared by the United States, Canada, and many Caribbean and Atlantic participants.
An NPA can be geographic, non-geographic, available, reserved, planned, assigned, or active in service. Geographic codes usually map to a state, province, territory, or overlay complex. Non-geographic and service codes cover uses such as toll-free ranges, abbreviated codes, or broader NANP service areas.
Lookup Core
The search path depends on the clue entered and the selected scope:
| User clue | Primary match behavior | Interpretation limit |
|---|---|---|
| Three-digit code | Matches the NPA directly and ranks the exact code first. | A valid code may still be unavailable, reserved, or not in service. |
| Ten-digit or +1 phone number | Extracts the first three NANP digits after +1 as the area code. | The remaining digits are not used to identify a subscriber or owner. |
| City, state, province, country, service, or overlay text | Searches visible area-code fields and optional reference city aliases. | City and coordinate hints are approximate search aids, not official boundaries. |
| Blank or broad query | Returns records allowed by the current scope, service filter, sort order, and row limit. | A filtered ledger can hide valid records outside the selected category. |
Status Rules
Area-code status is a rule classification based on assignment, reservation, and in-service fields:
| Displayed status | Rule | Typical use |
|---|---|---|
| In service | Assigned is yes and in-service is yes. | Ordinary caller, support, and routing context. |
| Assigned, not in service | Assigned is yes but the in-service flag is not active. | Planned or pending numbering activity. |
| Reserved | Reservation is yes and no active assignment is shown. | Planning, future use, or unavailable code checks. |
| Available | Assignable is yes and no active assignment or reservation is shown. | Numbering-resource context, not caller context. |
| Not assigned or special | No active, reserved, or available rule applies. | Special-use, invalid-for-caller, or nonstandard cases. |
Dialing and Planning Fields
Dialing rows use compact NANP notation. The code shows how many digits a caller may need, not whether the call is local or toll-rated:
| Notation | Meaning | What to verify |
|---|---|---|
| 7D | Seven-digit dialing using exchange and line number. | Confirm whether local rules still permit it, especially after 988 and overlay changes. |
| 10D | Area code plus the seven-digit local number. | Check whether the call also permits or requires a leading 1. |
| 1+10D | Leading 1, area code, and seven-digit local number. | Use the home and foreign NPA rows because local and toll patterns can differ. |
| NA or not listed | No applicable dialing value is listed for that context. | Do not infer a valid dialing procedure from a blank or service-code row. |
Planning letters, relief flags, jeopardy flags, parent codes, and overlay complexes are numbering-administration fields. They help explain why a code exists or why a region gained another code, but they do not identify a caller, carrier account, device, or street address.
Accuracy Notes:
The records shown in the page are based on NANPA area-code data dated 05/18/2026, with supplemental city and coordinate hints for search and plotting. Treat the official status and dialing fields as stronger evidence than the city and coordinate hints.
- Area-code data can change when new overlays, relief plans, or service codes are introduced.
- Reference cities and plotted coordinates are centroids or aliases, not coverage polygons.
- Caller ID can be spoofed, and valid local-looking numbers can be used in misleading calls.
- The lookup does not require GPS permission or a contact upload; the typed query is checked against the records available in the page.
Worked Examples:
San Francisco area code:
Entering 415 selects an in-service geographic record for California with San Francisco as the reference city, Pacific Time as the time zone, and 415/628 as the overlay complex. The Code Snapshot is useful for a support note, while the Dial Plan confirms that this record lists 1+10D for home and foreign local and toll contexts.
Toll-free service code:
Entering 800 selects a non-geographic toll-free service record. The location appears as the NANP service area rather than a city or state, the overlay complex groups related toll-free codes, and the dialing fields are not applicable. That result should not be mapped to a caller's city.
Province search:
Entering Ontario with current assigned codes searches the province records and returns a ledger of matching Canadian NPAs. Raising the ledger limit can make the Match Ledger more useful; Reference Plot remains empty when the bundled records do not include supplemental coordinates for those province matches.
No-match cleanup:
Entering 4150 is too long to be a three-digit NPA and too short to be a NANP phone number, so the summary can show no match. Remove the extra digit, enter a full ten-digit number, or switch to a place phrase that appears in the area-code records.
FAQ:
What countries are covered by NANP area codes?
The NANP shares country code +1 across the United States and its territories, Canada, Bermuda, and many Caribbean and Atlantic countries and territories. The country field shows the participating country or NANP service area when a record is non-geographic.
Can an area code prove where a caller is now?
No. Use the area code as assignment context only. Mobile numbers, VoIP numbers, forwarding, number portability, and caller ID spoofing can all separate the displayed number from the caller's real location.
Why does a full phone number work?
For a ten-digit NANP number, or an eleven-digit number that starts with 1, the lookup uses the first three domestic digits as the area code. It does not identify the subscriber or validate ownership of the number.
Why do some local calls require ten digits?
Overlays and some 988-related changes require the area code for local dialing. Check the Dial Plan rows for 7D, 10D, and 1+10D values before assuming that seven-digit dialing still works.
Why did my city search miss a code?
City names are supplemental hints and may not cover every place in an area code. Try the state, province, country, known three-digit code, or all-record scope when the city name is absent, misspelled, or not the reference city used for that record.
Glossary:
- NANP
- The North American Numbering Plan, the shared +1 telephone numbering plan.
- NPA
- The three-digit Numbering Plan Area code, commonly called an area code.
- NXX
- The three-digit central office code or exchange after the area code.
- Overlay complex
- A set of area codes serving the same geographic area.
- Relief planning
- Numbering work used when an area code needs added numbering capacity.
- Jeopardy
- A numbering-resource condition where central office codes may exhaust before relief is ready.
References:
- About the North American Numbering Plan, NANPA.
- NPA Reports, NANPA.
- CO Codes/Thousands-Blocks, NANPA.
- Abbreviated Codes, NANPA.
- Unwanted Calls/Texts - Phone, Federal Communications Commission.
- Fake Caller ID Schemes, U.S. Government Accountability Office, December 18, 2019.