Agar, SD ZIP Codes, Area Codes and Address Format

City guides  |  May 16, 2026  |  2 min read

Agar is one of the busiest mail areas in South Dakota, with 1 standard ZIP codes in Sully County. Here is everything you need to format a Agar address correctly.

State

South Dakota (SD)

County

Sully County

Standard ZIP codes

1

Time zone

Central

Agar ZIP codes

These are the standard delivery ZIP codes for Agar. The city has 1 ZIP codes in total when PO Box and unique codes are included.

• 57520

Area codes in Agar

Agar phone numbers use 605. A single area code keeps local numbers easy to recognize.

Sample Agar addresses

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Agar

• End the address with AGAR, SD and the five-digit ZIP code.
• Put apartment or suite numbers at the end of the street line.
• Use USPS abbreviations such as ST, AVE and BLVD.
• Match the ZIP code to the street. Agar has 1 codes, so the city name alone is not enough.

More South Dakota cities

Aberdeen, Rapid City, Armour, Alpena, Andover, or see all South Dakota cities.