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Westminster, Colorado

Located in Adams/Jefferson County, Colorado, Westminster was established in 1870. Westminster built an entirely new downtown from scratch — unusual for any city. The Butterfly Pavilion was the first stand-alone invertebrate zoo in the U.S.
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Founded 1870 | Population 113,000 | Peak 113,000 (2024) | County Adams/Jefferson County

Top 10 Most Important Events for Westminster, Colorado

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1870Farming Community: Settlement between Denver and Boulder.
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1942Military Presence: Military installations became a major part of Westminster's identity and economy.
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1990Butterfly Pavilion: First stand-alone invertebrate zoo in U.S. opens.
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2015Downtown Development: City creates new downtown Westminster from scratch.
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Latest News in Westminster

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Complete Historical Timeline

1870 Culture
Farming Community
1942 Government
Military Presence
1990 Culture
Butterfly Pavilion
2015 Business
Downtown Development

Did You Know?

1
Westminster built an entirely new downtown from scratch — unusual for any city.
2
The Butterfly Pavilion was the first stand-alone invertebrate zoo in the U.S.
3
Westminster straddles the border of Adams and Jefferson counties.
4
Westminster is located in Adams/Jefferson County, Colorado.
5
Westminster was founded in 1870.
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