Get a local business phone number in Custer, SD

Custer area codes

Custer city is a Census place in Custer County, South Dakota, with an estimated 1,829 residents in 2024. All 3 exchanges NANPA lists for its rate center are in area code 605. Custer is in the Central and Mountain time zone.

According to NANPA's dialing-plan data, local calls within 605 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Custer exchanges by carrier

3 carriers hold the 3 exchanges assigned to Custer's rate center. New Cingular Wireless PCS, LLC - Il has the most, with 1. 2 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.

Exchanges (NPA-NXX) assigned in Custer

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Custer's rate center (CUSTER). The earliest assignment date recorded in the file for these codes is 2001. None were assigned in 2020 or later.

What makes a number local to Custer

NANPA ties every exchange to a rate center. For Custer that is CUSTER, so a number from one of these exchanges reads as local to people in and around Custer.

Keeping an existing Custer number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 605 when you pick it.

The local business market

Custer is part of the Rapid City, SD metro area, home to 156,000 people in 2024. County Business Patterns counted 5,269 business establishments in the Rapid City, SD metro area in 2023, employing 60,600 people. The largest sectors by establishment count are construction (737), retail trade (723), and accommodation and food services (574).

Business phone service in Custer

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 Custer 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.

Per-seat phone plans multiply by headcount. For the rounded average establishment size in the Rapid City, SD metro area, 12 users on RingCentral RingEX Core come to $360.00 a month and on Ooma Office Pro $299.40, at month-to-month list prices checked September 28, 2026. Callata comes to $239.00 a month for 12 users ($99 a month with 5 users included, then $20 per additional user), below both.