St. Mary Parish, Louisiana

St. Mary Parish 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
PARISH OF ST MARY GUS Population: 46,799 (2024) ID: 166016	County	Official County Government	Contact: CHIEF ADMINISTRATIVE OFFICER 500 MAIN ST, 5TH FLOOR COURTHOUSE, FRANKLIN LA 70538-6157
CITY OF MORGAN CITY GUS Population: 10,813 (2024) ID: 166124	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 1218, MORGAN CITY LA 70381-1218
CITY OF FRANKLIN GUS Population: 6,284 (2024) ID: 193427	Municipal	Municipal Government Within County	Contact: DIRECTOR OF FINANCE PO BOX 567, FRANKLIN LA 70538-0567
CITY OF PATTERSON GUS Population: 5,614 (2024) ID: 127854	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 367, PATTERSON LA 70392-0367
TOWN OF BERWICK GUS Population: 4,495 (2024) ID: 105785	Municipal	Municipal Government Within County	Contact: C.A. O. PO BOX 486, BERWICK LA 70342-0486
TOWN OF BALDWIN GUS Population: 1,665 (2024) ID: 127853	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 800, BALDWIN LA 70514-0800