Inside the metros we cover sit 29 Pennsylvania counties. Every one has a page here — its pest pressure, its place in its metro, and the services that reach it.
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Pennsylvania has 29 counties inside the metro areas this site covers — together about 18,006 square miles of the state, organised around the Philadelphia, Pittsburgh, Allentown, Harrisburg, Scranton, Lancaster metro areas. County pages exist because pest work is local at exactly this scale: licensing is by state, wildlife rules can vary locally, and a provider's actual service routes follow county and metro lines rather than state borders. Find your county below for its pest pressure profile and the metro guides that serve it.
Read down the list and the pattern is geographic: the counties nearest a metro core carry its density problems, the outer counties carry the edge-of-development ones — new subdivisions against farmland and woodland — and every county page on this index sets out which pattern applies there, and why.
By land, the covered counties run from Centre County (1,107 sq mi), Westmoreland County (1,028 sq mi), Lancaster County (944 sq mi) down to Philadelphia County at about 134 square miles. The metros anchoring coverage are Philadelphia (metro population 6,329,118; 5 covered counties in Pennsylvania); Pittsburgh (metro population 2,421,992; 8 covered counties in Pennsylvania); Allentown (metro population 887,615; 3 covered counties in Pennsylvania); Harrisburg (metro population 617,427; 3 covered counties in Pennsylvania); Scranton (metro population 574,418; 3 covered counties in Pennsylvania); Lancaster (metro population 563,159; 1 covered county in Pennsylvania); York (metro population 473,197; 1 covered county in Pennsylvania); Reading (metro population 440,072; 1 covered county in Pennsylvania); Erie (metro population 265,832; 1 covered county in Pennsylvania); Chambersburg (metro population 160,652; 1 covered county in Pennsylvania); State College (metro population 157,393; 1 covered county in Pennsylvania); Lebanon (metro population 146,380; 1 covered county in Pennsylvania). Hold those two scales together — the county's land and the metro's weight — and the county pages below read plainly: pressure follows the metro, exposure follows the land, and providers plan for both.
The state's pest calendar is anchored by its largest metro, Philadelphia: about 44 inches of precipitation a year, an average temperature near 56°F, roughly 30 days at 90°F or above and 77 days at or below freezing. Every county in this index lives inside that weather pattern, adjusted by its own distance from the metro core.
The pest signature across Pennsylvania runs through midatlantic country, and the names that recur on county pages statewide are subterranean termites, ticks, carpenter ants. The largest covered county in the state is Centre County at about 1,107 square miles, served through the State College metro. For metro-level guides, see the Pennsylvania state page.
The communities county residents actually name: Philadelphia (about 1,582,432 residents), Pittsburgh (about 303,620 residents), Allentown (about 125,320 residents), Reading (about 94,836 residents), Erie (about 94,156 residents), Bethlehem (about 77,069 residents) are the largest covered communities on this index; each sits inside one of the counties above, and its county page carries the local pest reading for that ground.
Philadelphia — a metro of 6,329,118 across 11 counties, where the watch list runs subterranean termites, ticks, carpenter ants — the standing pattern where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
Pittsburgh — 2,421,992 residents, 8 counties. First on its watch list: subterranean termites, then ticks and carpenter ants — the pattern of a metro where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
Allentown — 887,615 residents, 4 counties. First on its watch list: subterranean termites, then ticks and carpenter ants — the pattern of a metro where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
Harrisburg — a metro of 617,427 across 3 counties, where the watch list runs subterranean termites, ticks, carpenter ants — the standing pattern where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
Scranton — about 574,418 residents across 3 counties. The local watch list: subterranean termites, ticks and carpenter ants, in a metro where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
Lancaster — a metro of 563,159 across 1 counties, where the watch list runs subterranean termites, ticks, carpenter ants — the standing pattern where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
York — 473,197 residents, 1 counties. First on its watch list: subterranean termites, then ticks and carpenter ants — the pattern of a metro where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
Reading — a metro of 440,072 across 1 counties, where the watch list runs subterranean termites, ticks, carpenter ants — the standing pattern where humid summers and cold winters that swing pressure between termites, ticks and overwintering invaders.
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