Area code 720

Area code 720 at a glance

720 is one of 6 geographic area codes serving Colorado; NANPA records its in-service date as June 1, 1998. It is an overlay: 720 and 303 and 983 cover the same territory, so neighbors on the same street can have different area codes. It is in the Mountain time zone. The places with the most assigned exchanges include Denver, Longmont, Fort Lupton, Georgetown, and Keenesburg. By population, its largest named places are Denver, Longmont, Fort Lupton, Bennett, and Keenesburg.

Cities and towns in area code 720

720 holds 26% of the 3,055 central office codes assigned in Colorado, the most of any code in the state. 8 Census places could be matched to rate centers with 720 exchanges; the most populous are Denver (729,000), Longmont (99,818), Fort Lupton (9,948), and Bennett (3,916). Each place page lists the exact prefixes and carriers for that town.

Dialing 720 numbers

According to NANPA's dialing-plan data, local calls within 720 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 permissible at service providers discretion"

Phone companies in area code 720

46 carriers hold the 785 central office codes assigned in 720. T-mobile USA, INC. has the most, with 132 (17%). 653 of the codes (83%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Rate centers and towns in 720

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 720 has codes in 12 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

720 code assignments over time

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 785 are assigned in 720, 98% of 800. 94 were assigned in 2020 or later.

A local 720 number on Callata

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

Porting a number you already use in area code 720 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.