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

Mute Swan Population Trend in Maryland

All statesWaterfowl

Mute Swan in Maryland has risen sharply: up 73% on the route-weighted index since 1992.

+73%Since 1992TrendPercent 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 →
6Routes 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 →
17YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Mute Swan Trends in MarylandNotable 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 increasecomputed 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 →

Mute Swan has risen sharply in Maryland: up 73% on the route-weighted index since 1992.

Mute Swan Survey Routes in Maryland

Routes recording Mute Swan in Maryland.
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 →
Eklo720022002
Harmony219931993
Golden Hill220031996
Honga220081992
Madison220081989
Melitota120082005

Mute Swan Population Trend in Other States

californiaconnecticutdelawareillinoisindianakentuckymassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorkohiopennsylvaniarhode-islandvirginiawisconsin

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