The Colorado State Archives has naturalization records for many of the counties in Colorado. People immigrating to Colorado between 1861 and 1906 could file for naturalized status in the county, district, or sometimes even the criminal courts. While this function became primarily a federal responsibility thereafter, many state district courts continued to record naturalizations after 1906.
Before 1906, the primary record series include which were usually filed in a Naturalization Record volume. These earlier naturalization records include less information than later documents. Typically, there is only the applicant's name, the name of the clerk of the court, the name and title of the head of state the applicant renounced allegiance to, and the date of the document.
Also note, between 1855-1922 alien women were granted automatic citizenship if they were the wife of a United States or naturalized citizen. Therefore, we may not have any specific documentation showing the naturalization of a woman during this time period.
Naturalization Records held by the Colorado State Archives
COLORADO COUNTY/DISTRICT COURT FILINGS
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ADAMS COUNTY
- Index 1906-1954; Declarations of Intention 1905-1951
- Final Documents 1906-1954
- Petitions Granted or Denied 1929-1954
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ALAMOSA COUNTY
- Declarations of Intention 1915-1968
- Final Documents 1915-1991
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BOULDER COUNTY
- Indexes 1872-1958
- Declarations of Intention 1872-1958
- Final Documents 1879-1958
- Certificate of Naturalization Stub Books 1907-1929
- Petitions Granted or Denied 1903-1906, 1930-1958
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CHAFFEE COUNTY
- Declarations of Intention 1881 – 1905
- Final Documents 1881 - 1906
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CONEJOS COUNTY
- Declarations of Intention 1882-1937
- Final Documents 1882-1948
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COSTILLA COUNTY
- Index 1877-1931
- Declarations of Intention 1874-1941
- Final Documents 1871-1942
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CUSTER COUNTY
- Index 1881-1927
- Declarations of Intention 1876-1940
- Final Documents 1881-1941
- Certificate of Naturalization Stub Books 1908-1927
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DENVER (ARAPAHOE BEFORE 1904)
- Indexes 1862-1915
- Declarations of Intention 1862-1914
- Final Documents 1880-1915
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DOLORES COUNTY
- Declarations of Intention 1881-1905
- Final Documents 1881-1906
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DOUGLAS COUNTY
- Declarations of Intention 1883-1911
- Final Documents 1903-1920
- Justice Court Declarations and Finals 1870-1890
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EAGLE COUNTY
- Declarations of Intention 1883-1904
- Final Documents 1883-1904
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ELBERT COUNTY
- Declarations of Intention 1875-1928
- Final Documents 1886-1931
- Certificate of Citizenship Stub Book 1913-1917
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EL PASO COUNTY
- Index 1869-1970
- Declarations of Intention 1879-1969
- Final Documents 1880-1970
- Certificate of Naturalization Stub Books 1907-1927
- Witness Depositions 1953-1960
- Petitions Granted or Denied 1929-1970
- Repatriations 1938-1964
- Transfer Petitions 1953-1969
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FREMONT COUNTY
- Index 1882-1966
- Declarations of Intention 1869-1906
- Final Documents 1883-1903
- Final Oaths 1890-1903
- Petition Books 1906-1929
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GILPIN COUNTY
- Indexes 1869-1917
- Declarations of Intention 1861-1941
- Final Documents 1863-1941
- Certificate of Naturalization Stub Books 1908-1928
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HUERFANO COUNTY
- Index 1882-1958
- Declarations of Intention 1887-1958
- Final Documents 1882-1957
- Petitions Granted or Denied 1929-1957
- Repatriations 1940-1954
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JACKSON COUNTY
- Index 1910-1940
- Declarations of Intention 1910-1940
- Final Documents 1932-1940
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JEFFERSON COUNTY
- Index 1862-1955
- Declarations of Intention 1862-1952
- Final Documents 1876-1953
- Certificate of Naturalization Stub Books 1916-1927
- Petitions Granted or Denied 1930-1955
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KIT CARSON COUNTY
- District Court Declarations of Intentions 1889-1936
- Final Certificates 1889-1906
- Petitions 1906-1940
- Stub Books – Finale 1907-1926
- Naturalization Supporting Documents - Various Dates
- LA PLATA COUNTY
- Index 1873-1908
- Declarations of Intention 1873-1907
- Final Documents 1881-1908
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LAS ANIMAS COUNTY
- Declarations of Intention 1872-1961
- Final Documents 1881-1958
- Repatriations 1937-1967
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LARIMER COUNTY
- Index 1872-1958
- Declarations of Intention 1872-1957
- Final Documents 1874-1958
- Certificate of Naturalization Stub Books 1907-1929
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LINCOLN COUNTY
- Indexes to Most Volumes Available 1889-1929
- Declarations of Intention 1889-1947
- Final Documents 1889-1947
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MESA COUNTY
- Index (District Court Only) 1905-1987
- Declarations of Intention 1883-1977
- Final Documents 1884-1994
- Naturalization Orders 1929-1987
- Transfer Petitions 1956-1973
- Repatriation Book 1945-1966
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MINERAL COUNTY
- Declarations of Intention 1893-1905
- Final Documents 1893-1904
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MOFFAT COUNTY
- Index 1902-1959
- Index to Declarations of Intention 1912-1928
- Declarations of Intention 1905-1929
- Index to Certificate of Naturalization Stub Books 1912-1926
- Certificate of Naturalization Stub Books 1902-1925
- Final Documents 1912-1959
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MONTEZUMA COUNTY
- Declarations of Intention 1889-1905
- Final Documents 1889-1906
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MORGAN COUNTY
- Declarations of Intention 1889-1952
- Final Documents 1907-1958
- Orders and Petitions Granted 1929-1958
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OURAY COUNTY
- Index 1878-1918
- Declarations of Intention 1878-1918
- Final Documents 1878-1918
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PARK COUNTY
- Declarations of Intention 1873-1928
- Certificate of Naturalization Stub Books 1909-1930
- Petitions 1873-1906
- Petitions Granted or Denied 1932-1940
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PHILLIPS COUNTY
- Declarations of Intention 1889-1941
- Final Documents 1889-1930
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PUEBLO COUNTY
- Indexes 1878-1913, 1949-1983
- Declarations of Intention 1878-1913, 1949-1978
- Transfer Petitions 1953-1976
- Petitions Granted or Denied 1949-1985
- Repatriations 1949-1969
- Final Documents 1877-1913, 1949-1983
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RIO GRANDE COUNTY
- Declarations of Intention 1874-1906
- Final Documents 1874-1906
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ROUTT COUNTY
- Index 1885-1966
- Declarations of Intention 1885-1892, 1907-1963
- Certification of Naturalization Stub Books 1907-1926
- Petitions Granted or Denied 1930-1967
- Repatriations 1940-1957
- Final Documents 1885-1892, 1930-1966
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SAGUACHE COUNTY
- Declarations of Intention 1869-1940
- Certificate of Naturalization Stub Books 1907-1923
- Final Documents 1878-1940
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SAN JUAN COUNTY
- Index 1877-1926
- Declarations of Intention 1877-1927
- Final Documents 1880-1904, 1912-1929
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TELLER COUNTY
- Index 1899-1941
- Declarations of Intention 1899-1941
- Final Documents 1899-1941
- Certificate of Naturalization Stub Books 1907-1929
- Petitions Granted or Denied 1929-1941
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WELD COUNTY
- Index 1871-1961
- Declarations of Intention 1884-1964
- Final Documents 1880-1966
- Certificate of Naturalization Stub Books 1909-1923
U.S. DISTRICT COURT FILINGS
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DENVER
- Dockets 1906-1916
- Declarations of Intention 1877-1952
- Final Documents 1906-1946
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PUEBLO
- Declarations of Intention 1906-1949
- Final Documents 1912-1949
- Miscellaneous Documents 1883-1922