BirdAnalyst
Species · Pennsylvania · BBS 2025 Release · 1966–2024

Swamp Sparrow Population Trend in Pennsylvania

All statesGeneralists

Swamp Sparrow in Pennsylvania has risen sharply: up 57% on the route-weighted index since 1968.

+57%Since 1968
71Routes In State
58Years

Notable Swamp Sparrow Trends in Pennsylvania

long arc increasecomputed index

Swamp Sparrow has risen sharply in Pennsylvania: up 57% on the route-weighted index since 1968.

Swamp Sparrow Population Forecast in Pennsylvania

If the recent trend holds, Swamp Sparrow in Pennsylvania is projected to fall about 15% by 2029 — from 0.80 in 2024 to a central estimate of 0.68 (95% range 0.46–0.90). A 5-year backtest shows a typical error of ±23.4%, with 60% of held-out values landing inside the 95% band.

-15%Change by 2029
0.68Projected 2029 index
0.46–0.9095% range
±23.4%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.660.430.88
20260.660.440.89
20270.670.440.89
20280.670.450.90
20290.680.460.90

Swamp Sparrow Survey Routes in Pennsylvania

Routes recording Swamp Sparrow in Pennsylvania.
Betula1420221987
Ferris Crnrs1320241966
Eldred820221995
Starlight 2620242015
Honesdale620241972
Starlight619921970
Greentown520241973
Poyntelle520241969
Ridgway419921989
Rasselas420221989
Sugar Grove420241983
Harmonsburg320231968
Teepleville320241966
Ellenton320241982
Arnot320241971
Little Marsh320241972
Mawr Glen320231988
Austinville320241967
Susquehanna320241975
Hometown319661966
Clearfield320021968
Akeley219751966
N Washington220241984
Logue220231970
Rush220241973

Swamp Sparrow Population Trend in Other States

connecticutdelawareillinoisindianaiowamainemarylandmassachusettsmichiganminnesotanebraskanew-hampshirenew-jerseynew-yorknorth-dakotaohiorhode-islandsouth-dakotavermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.