Seminole County, Florida

Seminole County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF SEMINOLE GUS Population: 494,605 (2024) ID: 161568	County	Official County Government	Contact: CHAIRMAN 1101 E 1ST ST, SANFORD FL 32771-1468
CITY OF SANFORD GUS Population: 66,919 (2024) ID: 207688	Municipal	Municipal Government Within County	Contact: DIRECTOR OF FINANCE PO BOX 1788, SANFORD FL 32772-1788
CITY OF ALTAMONTE SPRINGS GUS Population: 47,261 (2024) ID: 161712	Municipal	Municipal Government Within County	Contact: DEVELOPMENT SPECIALIST 225 NEWBURYPORT AVE, ALTAMONTE SPRINGS FL 32701-3697
CITY OF OVIEDO GUS Population: 41,901 (2024) ID: 161713	Municipal	Municipal Government Within County	Contact: MAYOR 400 ALEXANDRIA BLVD, OVIEDO FL 32765-6764
CITY OF WINTER SPRINGS GUS Population: 39,822 (2024) ID: 161714	Municipal	Municipal Government Within County	Contact: ASSISTANT TO THE CITY MANAGER 1126 E STATE ROAD 434, WINTER SPRINGS FL 32708-2799
CITY OF CASSELBERRY GUS Population: 31,650 (2024) ID: 102009	Municipal	Municipal Government Within County	Contact: MAYOR 95 TRIPLET LAKE DR, CASSELBERRY FL 32707-3399
CITY OF LONGWOOD GUS Population: 17,089 (2024) ID: 189818	Municipal	Municipal Government Within County	Contact: ECONOMIC DEVELOPMENT MANAGER 175 WEST CHURCH AVE, LONGWOOD FL 32750
CITY OF LAKE MARY GUS Population: 16,989 (2024) ID: 124287	Municipal	Municipal Government Within County	Contact: COMMUNITY DEVELOPMENT DIRECTOR 100 N COUNTRY CLUB RD, LAKE MARY FL 32746-3525