In the hundred years since the library was built, Sebago’s population has grown fivefold.
- 1925: the library, then called East Sebago Library, was built
- 1930 census: population 470
- 1940 census: population 518
- 1950 census: population 577
- 1960 census: population 546
- 1970 census: population 708
- 1980 census: population 994
- 1990 census: population 1259
- 2000 census: population 1433
- 2010 census: population 1719
- 2020 census: population 1911
- 2023 estimated: population 2111
Sebago’s population growth rate is estimated at .41%/year.