BirdAnalyst
BBS Route · Maryland · BCR 28

Williamsport Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 115 species recorded across 59 survey years, still active.

115Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
59Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
12Observers

Bird Species Found on Maryland Williamsport

Top 40 of 115 species by most recent count. Each links to its species trend.

Species recorded on the Williamsport route.
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 →TrendPercent 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 →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
Common GrackleIcteridae3552025-14%1968
European StarlingSturnidae2252025+26%1968
American RobinTurdidae1512025+199%1968
Rock PigeonColumbidae1332025+52%1968
House SparrowPasseridae1232025-51%1968
Northern CardinalCardinalidae982025+376%1968
Red-winged BlackbirdIcteridae902025+4%1968
Mourning DoveColumbidae862025+174%1968
Chipping SparrowPasserellidae572025+324%1968
Barn SwallowHirundinidae562025+600%1968
Northern MockingbirdMimidae542025+75%1968
Chimney SwiftApodidae522025+95%1968
House FinchFringillidae52202518×1982
Gray CatbirdMimidae51202520×1968
Carolina WrenTroglodytidae47202516×1968
Cedar WaxwingBombycillidae46202515×1980
Indigo BuntingCardinalidae362025+120%1968
Brown-headed CowbirdIcteridae332025+325%1968
American GoldfinchFringillidae302025+623%1968
Song SparrowPasserellidae302025+69%1968
American CrowCorvidae292025-43%1968
Northern House WrenTroglodytidae252025+67%1968
Eastern Wood-PeweeTyrannidae23202519×1969
Carolina ChickadeeParidae232025+713%1970
Tufted TitmouseParidae192025+97%1968
Red-bellied WoodpeckerPicidae182025+833%1970
Baltimore OrioleIcteridae182025+57%1968
Turkey VultureCathartidae152025+190%1986
Blue-gray GnatcatcherPolioptilidae152025+733%1982
Grasshopper SparrowPasserellidae142025-21%1968
Eastern KingbirdTyrannidae132025+800%1968
Great Crested FlycatcherTyrannidae132025+65%1968
Blue JayCorvidae132025+144%1968
Field SparrowPasserellidae132025+0%1968
Northern Rough-winged SwallowHirundinidae132025+520%1975
Eastern MeadowlarkIcteridae122025-53%1968
Eastern BluebirdTurdidae122025+617%1983
Horned LarkAlaudidae112025+250%1968
Fish CrowCorvidae112025+42%1968
Brown ThrasherMimidae112025+117%1968

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.