503
Covers northwestern Oregon
One of the original area codes of 1947
Overlay with 971
City facts
Hillsboro area codes
Area codes for northwestern Oregon: history, overlays and how to dial.
503971
Hillsboro uses area codes 503 and 971. Because more than one area code serves the same area, local calls need all ten digits.
About these area codes
971
Covers northwestern Oregon
In service since 2008
Overlay with 503
How to call a number in Hillsboro
Inside the US
1 (503) 555-0123Dial 1, the area code, then the seven-digit number.Local call
(503) 555-0123Overlay area: always include the area code.From outside the US
+1 503 555 0123Use your country's exit code or +, then 1 for the US.Hillsboro is on Pacific Time (PT); check the time before calling from another zone.
Other cities that share these codes
Hillsboro quick facts
Hillsboro was settled in 1841 and incorporated on October 19, 1876. It is named for David Hill.
Settled1841
Incorporated1876October 19, 1876
CountyWashington CountyOregon
Area codes503, 971Population107,050Census ACS estimateZIP codes297123, 97124Elevation148 ft45 m
Time zonePacific TimePT
Dates, namesake and elevation from Wikipedia: Hillsboro, Oregon and Wikidata (checked 2026-11-08); population and ZIP codes from the U.S. Census Bureau.
Questions
What area code is Hillsboro?
Hillsboro uses area codes 503 and 971. Because more than one area code serves the same area, local calls need all ten digits.
When did area code 503 start?
Area code 503 is one of the original North American area codes of 1947.
When did area code 971 start?
Area code 971 dates from 2008.
Do I need to dial the area code for local calls in Hillsboro?
Yes. 503 and 971 share the same area as an overlay, so every local call needs the area code plus the seven-digit number (ten digits).
What time zone is area code 503 in?
Hillsboro is on Pacific Time (PT).
What other cities use area code 503?
Other cities in this network that share 503 and 971 include Beaverton.
Sources: Area codes 503 and 971, Area codes 503 and 971 (Wikipedia) and Wikidata, checked 2026-11-08. Numbering plans change; the North American Numbering Plan Administrator is the official record.