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

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 →
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 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 2029 — from 48 in 2024 to a central estimate of 0.00 (95% range 0.00–49). A 5-year backtest shows a typical error of ±77.8%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–4995% 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 →
±77.8%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, House Sparrow in Indiana is projected to fall about 100% by 2029 — from 48 in 2024 to a central estimate of 0.00 (95% range 0.00–49). A 5-year backtest shows a typical error of ±77.8%, with 100% 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 →
2025100.0059
20266.60.0056
20273.00.0052
20280.000.0049
20290.000.0049

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
Lagrange16020241999
Berne14920241966
Packertown 213820242005
Plainfield13019991999
Decatur12720241999
Kokomo11620241993
Columbia Cty11320241981
Wabash10420241981
Shelbyville9520241983
Maplewood9120212000
Middlebury8920241989
Washington8920241987
Jamestown8520241986
Gary7519991980
New Castle7520242002
Monticello7120241981
Galveston6920241981
Cumback6520211966
Middletown5920241966
Sexton5420241981
Montpelier5420242018
Newberry5320241999

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 2026-05-22.