Colorado business phone guide

Colorado by the numbers

Colorado had 6.0 million residents in the Census Bureau's July 2024 estimate, up 3.2% from April 2020. The U.S. population grew 2.6% over the same period. County Business Patterns counted 182,486 business establishments in the state in 2023 with 2,566,040 mid-March employees and $181.4 billion in annual payroll. The average establishment has 14.1 employees. 59.6% of establishments with employees had fewer than five people. The three largest sectors by establishments are professional, scientific, and technical services (28,143), construction (20,473), and health care and social assistance (19,456).

How Colorado's businesses compare

Colorado has 30.6 business establishments per 1,000 residents, 24.6% above the U.S. figure of 24.6. Establishments average 14.1 employees against 16.7 nationally, and payroll per employee is $70,681 (3.4% above the U.S. $68,342). 59.6% of establishments with employees have fewer than five people (U.S.: 55.5%), while 4.7% have 50 or more. Because a handful of large employers lift the average, the share of very small establishments says more about who buys a small-business phone system.

Phone numbers and carriers in Colorado

NANPA lists 6 geographic area codes in service in Colorado, with 3,055 central office codes assigned across 208 rate centers and held by 107 carriers. 720 has the most assigned codes (785). 5 of them are part of overlays. The newest in service is 748, since July 7, 2025.

Small-business industries in Colorado

Among the 141 phone-heavy small-business industries these guides cover, the largest in Colorado by establishment count are offices of real estate agents and brokers (7,456), full-service restaurants (5,074), and limited-service restaurants (4,753). Follow an industry for its metro-level counts and what a phone system costs a typical team.

Metro and micropolitan areas

17 Census metro or micropolitan areas include part of Colorado. The largest is Denver, CO with 3.1 million residents.

Choosing an area code in Colorado

Every Colorado area code requires ten-digit dialing for local calls, according to NANPA's dialing-plan data, so customers always see and dial the full number. In overlays (303/720/983 and 748/970), the codes share one territory, so a new number may come from any code in the overlay. The city pages show which codes dominate each place, which is the best guide to the number your customers will recognize.

Largest Colorado cities for local numbers

83 Colorado cities and towns have their own local-number page. The most populous are Denver (303/720), Colorado Springs (719), Fort Collins (970), and Greeley (970).

What phone service costs a Colorado business

The comparison below uses 14 users, the rounded average establishment size in Colorado. At list prices checked September 28, 2026, that is $349.30 a month on Ooma Office Pro and $420.00 on RingCentral RingEX Core. Callata comes to $279.00 a month for 14 users ($99 a month with 5 users included, then $20 per additional user), below both.

Callata in Colorado

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 Colorado 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.