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

Swamp Sparrow Population Trend in Delaware

All statesGeneralists

Swamp Sparrow in Delaware has held roughly steady: up 7% on the route-weighted index since 1968.

+7%Since 1968
12Routes In State
54Years

Notable Swamp Sparrow Trends in Delaware

No notable trend signals for Swamp Sparrow in Delaware. See the full index history below.

Swamp Sparrow Population Forecast in Delaware

If the recent trend holds, Swamp Sparrow in Delaware is projected to rise about 275% by 2029 — from 0.20 in 2024 to a central estimate of 0.75 (95% range 0.00–2.1). A 5-year backtest shows a typical error of ±302.1%, with 100% of held-out values landing inside the 95% band.

+275%Change by 2029
0.75Projected 2029 index
0.00–2.195% range
±302.1%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
20250.760.002.1
20260.760.002.1
20270.760.002.1
20280.750.002.1
20290.750.002.1

Swamp Sparrow Survey Routes in Delaware

Routes recording Swamp Sparrow in Delaware.
Milton319801974
Dover219871967
Holleyville219761976
Lowes Xrds219691969
Blackbird220231994
Holleyville 2220062006
Pepperbox220082005
Mt Pleasant119851975
Wilmington119901967
Harrington120241967
Bethany Bch119661966
Georgetown119981998

Swamp Sparrow Population Trend in Other States

connecticutillinoisindianaiowamainemarylandmassachusettsmichiganminnesotanebraskanew-hampshirenew-jerseynew-yorknorth-dakotaohiopennsylvaniarhode-islandsouth-dakotavermontvirginiawest-virginiawisconsin

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