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Species · Illinois · BBS 2025 Release · 1966–2024

American Crow Population Trend in Illinois

All statesGeneralists

American Crow in Illinois has edged up: up 15% on the route-weighted index since 1968.

+15%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 →
58YearsYears 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 11% by 2029 — from 23 in 2024 to a central estimate of 20 (95% range 11–30). A 5-year backtest shows a typical error of ±23.3%, with 80% of held-out values landing inside the 95% band.

-11%Change by 2029TrendPercent 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 →
20Projected 2029 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 →
±23.3%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 11% by 2029 — from 23 in 2024 to a central estimate of 20 (95% range 11–30). A 5-year backtest shows a typical error of ±23.3%, with 80% of held-out values landing inside the 95% band.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 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 →
2025211131
2026211131
2027211130
2028211130
2029201130

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 →
Flora10920241976
Athens8820241995
Belknap8120241970
Pulaski7420241970
Beaverdam Lk7120231970
Buda5820231977
Sandusky5720231993
Mt Vernon5320241971
Alden5220232019
Bremen5120241969
Cave In Rock5120241993
Kell4720242001
Delwood4620241970
Karnak4520242001
York4420241993
Sheffield4020241966
Brownville4020241993
Cherry Val3920031972
Mascoutah Lk3920241967
Terre Haute3620241966
Clarksdale3620231968
Martinsville3620241970
Dudleyville3520242001
Le Roy3420241993
Guilford3320231967

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 2026-05-22.