CN
Clarence Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Clay-County, Iowa
Our Model Tree links this Clarence Nelson across the 1920, 1930 and 1940 US Censuses in Clay-County, Iowa (XGBoost, ~Confirmed), with identified parents August & August — first a head (b.~1913), then head of a 4-person household.
Age 27
b. ~1913
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Clay-County, Iowa |
| Surname | Nelson |
| Given Name | Clarence |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Douglas Township |
| 1935 Residence (County) | Clay |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 72 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Douglas Township |
| Est. Birth Year | ~1913 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Clarence | Age | Birth yr |
|---|---|---|---|---|
| Marcella Nelson | Daughter | — | 5 | ~1935 |
| Clarence Nelson | Head | — | 27 | ~1913 |
| Clarence Nelson | Son | — | 2 | ~1938 |
| Thelma Nelson | Spouse | — | 25 | ~1915 |
Census Appearances
1920
Clay, Iowa
Son, age 7
Clay, Iowa · implied b. ~1913 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Clarence S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Iowa |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Clay, Iowa
Son, age 17
Clay, Iowa · implied b. ~1913 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Clarence S |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Iowa |
| Occupation | Farm help |
| Industry | General farming |
| Class of Worker | VVVV |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Clay-County, Iowa
Head, age 27
Clay-County, Iowa · implied b. ~1913 — 4 household members
| Surname | Nelson |
| Given Name | Clarence |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Douglas Township |
| 1935 Residence (County) | Clay |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 72 |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Clarence Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father August Nelson (~0.92 confidence) and father August Nelson (~0.92 confidence) and mother Mary Nelson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
August Nelson
b. ~1889
Source father
● Household
· direct · ~0.92
Father
August Nelson
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Mary Nelson
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Clarence Nelson
Head · 1940 · age 27 · b. ~1913 · Iowa
★ 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 — Clay-County, Iowa
Open full size
1940 US Federal Census — Clay-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01148-00609)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marlene Ann Fiecker | 2 | Daughter | — | Iowa |
| 2 | George Jr Fiecker | 57 | Head | Farmer | Iowa |
| 3 | Lenta Fiecker | 48 | Wife | — | Wisconsin |
| 4 | Ralph Fiecker | 21 | Son | Farm Laborer | Iowa |
| 5 | Dorothy Fiecker | 15 | Daughter | — | Iowa |
| 6 | George Fiecker | 13 | Son | — | Iowa |
| 7 | Lee Lorenz | 25 | Head | Farmer | Iowa |
| 8 | Gertrude Lorenz | 21 | Wife | — | Iowa |
| 9 | Clarence Nelson THIS PERSON | 27 | Head | Farmer | Iowa |
| 10 | Thelma Nelson | 25 | Wife | — | Iowa |
| 11 | Marcella Ann Nelson | 5 | Daughter | — | Iowa |
| 12 | Clarence Jr Nelson | 2 | Son | — | Iowa |
| 13 | K. E. Calvert | 40 | Head | Farmer | Kentucky |
| 14 | Grace Calvert | 40 | Wife | — | Illinois |
| 15 | Margaret June Calvert | 14 | Daughter | — | Iowa |
| 16 | Thelma Jean Calvert | 11 | Daughter | — | Iowa |
| 17 | Jesse Hansen | 44 | Head | Farmer | Denmark |
| 18 | Anne Hansen | 20 | Daughter | — | Iowa |
| 19 | Irene Hansen | 19 | Daughter | — | Iowa |
| 20 | Herman Jespersen | 5 | Lodger | — | Iowa |
| 21 | Frank Matson | 57 | Head | Farmer | Iowa |
| 22 | Margaret Matson | 49 | Wife | — | Iowa |
| 23 | Dorothy Matson | 17 | Daughter | — | Iowa |
| 24 | Charlie Matson | 59 | Brother | Farm Laborer | Iowa |
| 25 | Harvey Matson | 48 | Brother | Farmer | Iowa |
| 26 | T. B. Johns | 78 | Head | Farmer | Germany |
| 27 | Rachel Johns | 70 | Wife | — | Iowa |
| 28 | Leo Johns | 29 | Son | Farm Laborer | Iowa |
| 29 | L. B. Mills | 48 | Head | Farmer | Iowa |
| 30 | Sophie Mills | 57 | Wife | — | Iowa |
| 31 | Cleo Joyce Mills | 16 | Daughter | — | Iowa |
| 32 | W. T. Whitcomb | 51 | Head | Farmer | Iowa |
| 33 | Ruby Whitcomb | 43 | Wife | — | Iowa |
| 34 | William Whitcomb | 16 | Son | — | Iowa |
| 35 | Isabelle Whitcomb | 14 | Daughter | — | Iowa |
| 36 | Hans Jacobson | 66 | Father-in-law | Farm Laborer | Iowa |
| 37 | Will Healer | 39 | Head | Farmer | Iowa |
| 38 | Marie Healer | 34 | Wife | Farmer | Iowa |
| 39 | Gerald Healer | 7 | Son | — | Iowa |
| 40 | Mrs. Dorothy Weakley | 68 | Head | — | Iowa |
Pedigree Summary
Clarence
Gen 1 · 3 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)