BirdAnalyst
Species · Illinois · BBS 2026 Release · 1966–2025

American Crow Population Trend in Illinois

All statesGeneralists

American Crow in Illinois has edged up: up 13% on the route-weighted index since 1968.

+13%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
105Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Crow Trends in IllinoisNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for American Crow in Illinois. See the full index history below.

American Crow Population Forecast in Illinois

If the recent trend holds, American Crow in Illinois is projected to fall about 15% by 2030 — from 24 in 2025 to a central estimate of 21 (95% range 11–30). A 5-year backtest shows a typical error of ±20.8%, with 80% of held-out values landing inside the 95% band.

-15%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
21Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
11–3095% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±20.8%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, American Crow in Illinois is projected to fall about 15% by 2030 — from 24 in 2025 to a central estimate of 21 (95% range 11–30). A 5-year backtest shows a typical error of ±20.8%, with 80% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2026211131
2027211131
2028211131
2029211131
2030211130

American Crow Survey Routes in Illinois

Routes recording American Crow in Illinois.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Dudleyville12120252001
Mt Vernon11020251971
Flora10920241976
Milford10520251966
Delwood7120251970
Beaverdam Lk7120231970
Belknap7020251970
Lake Summerset6520252001
Pulaski6420251970
Buda5820231977
York5820251993
Sandusky5720231993
Cave In Rock5120241993
Karnak4820252001
Athens4720251995
Bremen4520251969
Martinsville4420251970
Sheffield4020241966
Brownville4020251993
Cherry Val3920031972
Marshall3720252001
Kell3720252001
Clarksdale3620231968
Janesville3620251972
Humphrey3520251972

American Crow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.