Get a local business phone number in Sioux Falls, SD

Sioux Falls area codes

Sioux Falls, in Minnehaha County, South Dakota, had a Census-estimated population of 209,289 in July 2024. All 92 exchanges NANPA lists for its rate center are in area code 605. Sioux Falls 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 Sioux Falls

33 carriers hold the 92 exchanges assigned to Sioux Falls's rate center. Qwest Corporation has the most, with 29. 52 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Sioux Falls can come from any of these blocks; once it is yours, porting lets it move between providers.

Exchanges (NPA-NXX) assigned in Sioux Falls

A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Sioux Falls. The earliest assignment date recorded in the file for these codes is 2001. 8 of the 92 were assigned in 2020 or later.

When Sioux Falls's exchanges were assigned

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

How local numbers work in Sioux Falls

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

Keeping an existing Sioux Falls 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

Sioux Falls is part of the Sioux Falls, SD-MN metro area, home to 308,000 people in 2024. County Business Patterns counted 9,170 business establishments in the Sioux Falls, SD-MN metro area in 2023, employing 160,101 people. The largest sectors by establishment count are construction (1,254), retail trade (1,062), and health care and social assistance (913).

Setting up a Sioux Falls business line

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

If you already have a number in Sioux Falls, 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.

A 17-person team is the benchmark here, the rounded average establishment size in the Sioux Falls, SD-MN metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $510.00 a month and Ooma Office Pro $424.15. On Callata the same 17 people cost $339.00 a month, less than either per-seat plan.