Overview of the 227 Area Code
What is the 227 area code?
The 227 area code serves Columbia, Maryland, alongside other established area codes. When you see a 227 number, it indicates a local number within this geographic area.
Why was area code 227 created?
The 227 area code was introduced as an overlay to add numbers in Columbia once the existing area codes 240 and 301 began to run out of available prefixes. It added a new supply of numbers without requiring current residents to change their existing digits.
Geographic Coverage of the 227 Area Code
The 227 area code serves Columbia and surrounding areas in Maryland. It complements the coverage of area codes 240 and 301. This area code covers several key cities, including:
- Columbia
- Frederick
- Germantown
- Silver Spring
- Gaithersburg
- Rockville
Got a call from a 227 number? It came from Columbia, MD. Since 227 overlays with 240 and 301, every local call in the region needs all ten digits to land on the right line. Inside 227, Columbia holds about 4% of the population; the rest is split across 313 smaller cities.
Columbia Area Codes Overview
Columbia is served by multiple area codes, reflecting its telecommunications needs. The 227 area code operates alongside 240, 301. Here are the area codes serving this region:
The introduction of the 227 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 227 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| Columbia | MD | 99,615 | 0% | 7% |
| Frederick | MD | 89,537 | 0% | 100% |
| Germantown | MD | 86,395 | 0% | 100% |
| Silver Spring | MD | 71,452 | 0% | 100% |
| Gaithersburg | MD | 70,686 | 0% | 100% |
| Rockville | MD | 68,417 | 0% | 100% |
| Waldorf | MD | 67,752 | 1% | 100% |
| Bethesda | MD | 60,858 | 0% | 100% |
| Bowie | MD | 58,421 | 0% | 100% |
| Aspen Hill | MD | 48,759 | 0% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 227 been reported for unwanted calls?
Yes – 75 unwanted-call complaints were reported to the FTC for numbers showing a 227 area code (May 29 – Jul 2, 2026).
- 59% robocalls
- ↑ 8% vs prior period
Most-reported subjects
- Other45%34
- Reducing your debt (credit cards, mortgage, student loans)20%15
- Dropped call or no message11%8
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Frequently Asked Questions about the 227 Area Code
Who called me from a 227 number?
A 227 number is assigned to Columbia, Maryland, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 227 code to look nearby, so a 227 number doesn't prove the caller is local. Recently, 75 unwanted-call complaints were reported to the FTC for numbers showing the 227 code (59% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 227 a scam area code?
No area code is a scam on its own. 227 is a normal, officially assigned code for Columbia, Maryland. Spam callers spoof local codes to raise the odds you answer, so 227 on your caller ID says nothing about who is really calling. Recently, 75 unwanted-call complaints were reported to the FTC for numbers showing the 227 code (59% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 227 area code?
Repeated calls from different 227 numbers are usually spoofing: a robocaller rotates through 227 numbers so each call looks local and slips past simple blocks. Recently, 75 unwanted-call complaints were reported to the FTC for numbers showing the 227 code (59% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 227 number?
If you aren't expecting a 227 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 227 area code?
Block a single 227 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 227 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 227?
Area code 227 covers Columbia and the surrounding area in Maryland, spanning 314 cities with about 2,453,634 residents. It shares its area with overlay codes 240, 301.
Is 227 a real area code?
Yes. 227 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Columbia, Maryland. A real code can still show up on spoofed spam calls, so treat unknown 227 calls with normal caution.
How do I call a 227 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 227 and the seven-digit number. From a mobile phone you can usually just enter +1 227 followed by the number and let the phone add the exit code for you.