Maine’s population has long been distributed unevenly. Southern and mid-coast counties contain the state’s principal concentrations, while much of northern and western Maine remains comparatively sparsely settled.
Historical patterns show population shifting away from some northern areas and toward the south and mid-coast. Even within large counties such as Oxford and Penobscot, change may differ substantially from one community to another: southern communities can grow while smaller northern towns lose population.
Three historical views
The original entry presented county density maps for 1990, 2000, and 2010. The interpretive diagrams below preserve that chronological structure while avoiding false precision: they illustrate the broad historical pattern rather than reproducing the source maps or current measurements.
The north–south pattern
Across the two decades represented by the maps, the broad divide remained visible. York, Cumberland, and Androscoggin were the three most densely populated counties in 2010 and together accounted for more than 44 percent of Maine’s residents. By contrast, the six least densely populated counties accounted for less than 20 percent.
Density also helps explain why Maine’s congressional districts cover very different amounts of territory. When districts are redrawn to contain comparable populations, a district covering sparsely populated areas must extend across more land than one centered on denser communities. District boundaries can change after each decennial census, so the historical description should not be read as a statement of current boundaries.
What the maps do—and do not—show
County maps are useful for recognizing statewide structure, but they simplify local conditions. A large rural county may contain a relatively dense service center, and a denser county can still include rural towns, farmland, forests, and undeveloped land. Comparisons should also use consistent land-area definitions and census years.
