{"id":7567,"date":"2023-09-03T20:52:45","date_gmt":"2023-09-03T20:52:45","guid":{"rendered":"https:\/\/townsvillages.com\/us\/?p=7567"},"modified":"2026-08-22T17:16:17","modified_gmt":"2026-08-22T17:16:17","slug":"sully-county","status":"publish","type":"post","link":"https:\/\/townsvillages.com\/us\/sully-county\/","title":{"rendered":"Sully County, South Dakota"},"content":{"rendered":"

Sully County is a county in South Dakota, United States, on the east bank of the Missouri River in the central part of the state. It had a population of 1,446 at the 2020 census and covers 1,070 square miles (2,771 km2), of which 1,007 square miles are land and 63 square miles are water, centred near 44°43′N 100°08′W.<\/p>\n

Onida is the county seat and its postal code is 57564. The county has one city, one town and one census-designated place. Sully County is part of the Pierre, South Dakota Micropolitan Statistical Area and observes Central time.<\/p>\n

Towns & Villages in Sully County<\/h2>\n

Sully County’s population centres are small and spread along the old rail line and river bottoms. Onida is the only incorporated city; Agar is an incorporated town; Cow Creek is a census-designated place. Okobojo and Eakin are unincorporated place names carried over from the county’s rail-era post offices and no longer have residents counted separately by the Census Bureau.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Place<\/th>\nType<\/th>\nPop.<\/th>\nZIP<\/th>\n<\/tr>\n<\/thead>\n
Onida<\/td>\nCity · seat<\/td>\n962<\/td>\n57564<\/td>\n<\/tr>\n
Agar<\/td>\nTown<\/td>\n118<\/td>\n57520<\/td>\n<\/tr>\n
Cow Creek<\/td>\nCDP<\/td>\n—<\/td>\n57564<\/td>\n<\/tr>\n
Okobojo<\/td>\nUnincorp.<\/td>\n—<\/td>\n57564<\/td>\n<\/tr>\n
Eakin<\/td>\nUnincorp.<\/td>\n—<\/td>\n57520<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

ZIP Codes<\/h2>\n