Species · Delaware · BBS 2025 Release · 1966–2024
Warbling Vireo Population Trend in Delaware
Warbling Vireo in Delaware has declined: down 41% on the route-weighted index since 1971.
-41%Since 1971
8Routes In State
16Years
Notable Warbling Vireo Trends in Delaware
No notable trend signals for Warbling Vireo in Delaware. See the full index history below.
Warbling Vireo Survey Routes in Delaware
| Milton | 3 | 1972 | 1970 |
| Wilmington | 2 | 2008 | 1971 |
| Mt Pleasant | 1 | 2014 | 1970 |
| Harrington | 1 | 1973 | 1971 |
| Frederica | 1 | 1980 | 1969 |
| Dover | 1 | 1972 | 1972 |
| Holleyville | 1 | 1982 | 1973 |
| Blackbird | 1 | 2017 | 2013 |
Warbling Vireo Population Trend in Other States
alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.