Get a local business phone number in Clark, SD

Area codes in Clark

Clark, in Clark County, South Dakota, had a Census-estimated population of 1,167 in July 2024. All 3 exchanges NANPA lists for its rate center are in area code 605. Clark 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.

Phone carriers in Clark

2 carriers hold the 3 exchanges assigned to Clark's rate center. New Cingular Wireless PCS, LLC - Il has the most, with 2. 2 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.

Exchanges (NPA-NXX) assigned in Clark

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Clark's rate center (CLARK). The earliest assignment date recorded in the file for these codes is 2003. None were assigned in 2020 or later.

When Clark's exchanges were assigned

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

How local numbers work in Clark

What a caller sees as "local" is the area code plus prefix. In Clark, those come from the CLARK rate center, as recorded by NANPA.

Keeping an existing Clark 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

Clark is outside any Census metro or micropolitan area, so the figures below are statewide. County Business Patterns counted 29,106 business establishments in South Dakota in 2023, employing 383,805 people. The largest sectors by establishment count are retail trade (3,838), construction (3,802), and other services (except public administration) (2,986).

Business phone service in Clark

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 Clark, 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 13 users, the rounded average establishment size in South Dakota. At list prices checked September 28, 2026, that is $324.35 a month on Ooma Office Pro and $390.00 on RingCentral RingEX Core. On Callata the same 13 people cost $259.00 a month, less than either per-seat plan.