Get a local business phone number in Gresham, OR

What area code is Gresham, OR?

Gresham city is a Census place in Multnomah County, Oregon, with an estimated 111,507 residents in 2024. NANPA lists 32 exchanges for its rate center across 2 area codes; 503 has the most (22, 69%). 503 is part of an overlay with 971, so a new local number in Gresham may carry any of those codes depending on which have numbers available. Gresham is in the Pacific time zone.

According to NANPA's dialing-plan data, local calls within 503 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Gresham exchanges by carrier

13 carriers hold the 32 exchanges assigned to Gresham's rate center. Ziply Fiber Northwest, LLC d/b/a Ziply Fiber has the most, with 12. 23 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.

Gresham phone prefixes

These are the central office codes NANPA records for Gresham. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2006. 6 of the 32 were assigned in 2020 or later.

When Gresham's exchanges were assigned

Assignment dates show when each block of Gresham numbers was added to the local supply.

What makes a number local to Gresham

Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Gresham's numbers are rated to the GRESHAM rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Gresham number.

If your business already has a Gresham number, porting it to Callata is free and keeps it on your cards, listings and vehicles.

Businesses around Gresham

Gresham is part of the Portland-Vancouver-Hillsboro, OR-WA metro area, home to 2.5 million people in 2024. County Business Patterns counted 72,943 business establishments in the Portland, OR-WA metro area in 2023, employing 1,111,602 people. The largest sectors by establishment count are health care and social assistance (9,591), professional, scientific, and technical services (9,313), and construction (8,453).

Business phone service in Gresham

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

If you already have a number in Gresham, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.

The comparison below uses 15 users, the rounded average establishment size in the Portland, OR-WA metro area. At list prices checked September 28, 2026, that is $374.25 a month on Ooma Office Pro and $450.00 on RingCentral RingEX Core. On Callata the same 15 people cost $299.00 a month, less than either per-seat plan.