As an unincorporated community, Ottawa Lake has no legally defined boundaries or population statistics of its own but does have its own post office with the 49267 ZIP Code.

[4] The community is about 3 miles (4.8 km) north of the Ohio state border from the city of Sylvania.

Other nearby communities include Riga to the west and Whiteford Center and Lambertville to the east.

[10] Ottawa Lake received its first post office on June 12, 1846 with John Wilder serving as the first postmaster.

[1][2] The Toledo Suburban Airport is located in Whiteford Township and also uses the Ottawa Lake ZIP Code.