RJ
Ralph Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Boulder-County, Colorado
Our Model Tree links this Ralph Johnson across the 1910, 1920, 1930 and 1940 US Censuses in Boulder-County, Colorado (XGBoost, ~Confirmed), with identified parents Jonas & Isaac — first a son (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Male
Son
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Boulder-County, Colorado |
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Some house |
| 1935 Residence (County) | Boulder |
| Additional Details | |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 35 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Laborer |
| Township / Ward | Election Precinct 27 Louisville |
| Est. Birth Year | ~1908 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Ralph | Age | Birth yr |
|---|---|---|---|---|
| Jonas Johnson | Head | — | 70 | ~1870 |
| Ralph Johnson | Son | — | 32 | ~1908 |
| Hana Johnson | Spouse | — | 60 | ~1880 |
Census Appearances
1910
Denver, Colorado
Son, age 2
Denver, Colorado · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Swed Swedish |
| Mother's Birthplace | Swed Swedish |
| Occupation | none |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1920
Denver, Colorado
Son, age 12
Denver, Colorado · implied b. ~1908 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Boulder, Colorado
Son, age 22
Boulder, Colorado · implied b. ~1908 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | farm laborer |
| Industry | general farming |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Boulder-County, Colorado
Son, age 32
Boulder-County, Colorado · implied b. ~1908 — 3 household members
| Surname | Johnson |
| Given Name | Ralph |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Some house |
| 1935 Residence (County) | Boulder |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 35 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Ralph Johnson across 4 US Census years (1910, 1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father Jonas Johnson (~0.92 confidence) and father Isaac Johnson (~0.92 confidence) and father Oscar Johnson (~0.92 confidence) and father Oscar Johnson (~0.92 confidence) and mother Hana Johnson (~0.92 confidence) and mother Hilda Johnson (~0.92 confidence) and mother Hella Johnson (~0.92 confidence). The pedigree spans 1 generation with 7 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Jonas Johnson
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Isaac Johnson
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Oscar Johnson
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Oscar Johnson
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Hana Johnson
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Hilda Johnson
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Hella Johnson
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Ralph Johnson
Son · 1940 · age 32 · b. ~1908 · Colorado
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Boulder-County, Colorado
Open full size
1940 US Federal Census — Boulder-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00457-00431)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Virginia Lorenzi | 5 | daughter | — | Colorado |
| 42 | Gloria Lorenzi | 2 | daughter | — | Colorado |
| 43 | Catherine Lorenzi | 1 | daughter | — | Colorado |
| 44 | Willard Iverson | 73 | Head | Hoisting Engine | Missouri |
| 45 | Ira Walters | 58 | Head | Farmer | Colorado |
| 46 | Lela Walters | 44 | wife | — | Colorado |
| 47 | Eva Walters | 21 | daughter | Type Setter | Colorado |
| 48 | Jonas Johnson | 70 | Head | Laborer | Sweden |
| 49 | Hana Johnson | 60 | wife | — | Sweden |
| 50 | Ralph Johnson THIS PERSON | 32 | son | Laborer | Colorado |
| 51 | Joe Koeppler | 69 | Head | Farmer | Austria |
| 52 | Theresa Koeppler | 32 | wife | — | Austria |
| 53 | Anne Koeppler | 2 | daughter | — | Colorado |
| 54 | Josephine Stout | 68 | Head | — | Iowa |
| 55 | Ira Berry | 55 | Head | Miner | Illinois |
| 56 | Hope Berry | 46 | wife | — | Nebraska |
| 57 | Richard Berry | 22 | son | Miner | Illinois |
| 58 | Phyllis Berry | 16 | daughter | — | Illinois |
| 59 | Howard Berry | 13 | son | — | Illinois |
| 60 | Wesley Berry | 8 | son | — | Illinois |
| 61 | Celine Duquesney | 45 | Head | — | France |
| 62 | Lenore Duquesney | 19 | daughter | House Work | France |
| 63 | Yolande Duquesney | 16 | daughter | — | Indiana |
| 64 | Julia Gosselin | 67 | Head | — | France |
| 65 | Jules Gosselin | 31 | son | Miner | Colorado |
| 66 | Henry Gosselin | 28 | son | Miner | Colorado |
| 67 | Eric Brimble | 30 | Head | Miner | England |
| 68 | Catherine Brimble | 21 | wife | — | Colorado |
| 69 | Samuel Sidla | 55 | Head | Miner | England |
| 70 | Elizabeth Sidla | 61 | wife | — | England |
| 71 | Paul Fischer | 60 | Head | Farmer | Nebraska |
| 72 | Grace Fischer | 52 | wife | — | Colorado |
| 73 | Alvin Fischer | 23 | son | Laborer | Colorado |
| 74 | Marie Fischer | 91 | mother | — | Germany |
| 75 | Edward Hilder | 33 | Head | Farm Foreman | Colorado |
| 76 | Doris Hilder | 31 | wife | — | Colorado |
| 77 | William Newby | 27 | Head | Laborer | Colorado |
| 78 | Louise Newby | 27 | wife | Cook | Colorado |
| 79 | Ronald Newby | 2 | son | — | Colorado |
| 80 | Jim Simpson | 35 | Head | Milker | Colorado |
Pedigree Summary
Ralph
Gen 1 · 7 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)