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

House Sparrow Population Trend in Indiana

All statesGeneralists

House Sparrow in Indiana has collapsed: down 80% on the route-weighted index since 1968.

-80%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 →
68Routes 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 House Sparrow Trends in IndianaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

House Sparrow has collapsed in Indiana: down 80% on the route-weighted index since 1968.

House Sparrow Population Forecast in Indiana

If the recent trend holds, House Sparrow in Indiana is projected to fall about 100% by 2030 — from 47 in 2025 to a central estimate of 0.00 (95% range 0.00–50). A 5-year backtest shows a typical error of ±84.7%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–5095% 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 →
±84.7%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, House Sparrow in Indiana is projected to fall about 100% by 2030 — from 47 in 2025 to a central estimate of 0.00 (95% range 0.00–50). A 5-year backtest shows a typical error of ±84.7%, with 100% 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 →
20269.20.0059
20275.60.0055
20282.10.0052
20290.000.0050
20300.000.0050

House Sparrow Survey Routes in Indiana

Routes recording House Sparrow in Indiana.
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 →
Tipton27019921966
Packertown19020041967
Muncie16219971981
Packertown 213320252005
Plainfield13019991999
Shelbyville12520251983
Swayzee11820251981
Kokomo11620241993
Columbia Cty11320241981
Decatur9320251999
Newberry9120251999
Maplewood9120212000
Berne8920251966
Middlebury8820251989
Cuba8320252017
Middletown8120251966
Lagrange8020251999
Wabash7920251981
Witts Station7920252000
Gary7519991980
New Castle7520242002
Washington7320251987
Monticello7220251981
Portage 26420252005
Galveston6120251981

House Sparrow Population Trend in Other States

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

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