MN
Mary Nelson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clinton-County, Iowa
Our Model Tree links this Mary Nelson across the 1920, 1930 and 1940 US Censuses in Clinton-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1884), then head of a 7-person household.
Age 56
b. ~1884
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Clinton-County, Iowa |
| Surname | Nelson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Clinton City |
| Est. Birth Year | ~1884 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Harvey Nelson | Head | — | 59 | ~1881 |
| Marian Nelson | Other | — | 25 | ~1915 |
| Douglas Nelson | Other | — | ~1940 | |
| Merwin Nelson | Son | — | 26 | ~1914 |
| Neil Nelson | Son | — | 20 | ~1920 |
| Harvey Nelson | Son | — | 31 | ~1909 |
| Mary Nelson | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Clinton, Iowa
Spouse, age 35
Clinton, Iowa · implied b. ~1885 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | New York |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Clinton, Iowa
Spouse, age 46
Clinton, Iowa · implied b. ~1884 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 21 |
| Father's Birthplace | New York |
| Mother's Birthplace | Indiana |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Clinton-County, Iowa
Spouse, age 56
Clinton-County, Iowa · implied b. ~1884 — 7 household members
| Surname | Nelson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Highest Grade | H 4 |
| 1935 Residence | Iowa |
| 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 Mary Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Nelson
Spouse · 1940 · age 56 · b. ~1884 · Iowa
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Clinton-County, Iowa
Open full size
1940 US Federal Census — Clinton-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01150-00765)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward W Donahue | 42 | Head | Janitor | Illinois |
| 42 | Eva M Donahue | 44 | Wife | — | Iowa |
| 43 | William Martzahn | 62 | Head | Machine Operator | Iowa |
| 44 | Emma Martzahn | 55 | Wife | — | Iowa |
| 45 | Marian Martzahn | 32 | Daughter | Utility Worker | Iowa |
| 46 | Irene Schreiner | 30 | Lodger | — | Germany |
| 47 | Andrew P Jepson | 62 | Head | Butcher | Denmark |
| 48 | Sue V Jepson | 50 | Wife | — | Illinois |
| 49 | Donald A Jepson | 26 | Son | Electrician Helper | Iowa |
| 50 | Dorothy Jepson | 24 | Daughter | — | Iowa |
| 51 | Don Jepson | 21 | Son | Laborer | Iowa |
| 52 | Ralph Jepson | 19 | Son | Electrician Helper | Iowa |
| 53 | Andrew Jepson | 15 | Son | — | Iowa |
| 54 | Darrell Jepson | 13 | Son | — | Iowa |
| 55 | Thomas J Harrison | 63 | Head | Yard Foreman | Iowa |
| 56 | Ethel S Harrison | 49 | Wife | — | Sweden |
| 57 | Roger Harrison | 21 | Son | Clerk Operator | Iowa |
| 58 | Lois Harrison | 18 | Daughter | — | Iowa |
| 59 | Harvey B Nelson | 59 | Head | — | Iowa |
| 60 | Mary Nelson THIS PERSON | 56 | Wife | — | Iowa |
| 61 | Merwin D Nelson | 26 | Son | Laborer | Iowa |
| 62 | Neil Avels Nelson | 20 | Son | New Worker | Iowa |
| 63 | Harvey Rich Nelson | 31 | Son | Machinist | Iowa |
| 64 | Marian A Nelson | 25 | Daughter-in-law | — | Iowa |
| 65 | Douglas Rich Nelson | 0 | Grandson | — | Iowa |
| 66 | Roy Steiner | 33 | Head | Proprietor | Illinois |
| 67 | Edna Steiner | 32 | Wife | — | Iowa |
| 68 | Rodney Steiner | 12 | Son | — | Iowa |
| 69 | Shirley Steiner | 10 | Daughter | — | Iowa |
| 70 | Darrell Steiner | 9 | Son | — | Iowa |
| 71 | Patricia Steiner | 5 | Daughter | — | Iowa |
| 72 | Frank T Poston | 54 | Head | Clerk | Illinois |
| 73 | Edna Poston | 52 | Wife | — | Iowa |
| 74 | Lois Poston | 24 | Daughter | — | Iowa |
| 75 | William H Altman | 69 | Head | — | Pennsylvania |
| 76 | Olga Altman | 63 | Wife | — | Iowa |
| 77 | Emily S Gage | 71 | Head | — | Iowa |
| 78 | Robert H Gage | 54 | Son | Manager | Iowa |
| 79 | Fred Chadwick | 54 | Head | Physician | Wisconsin |
| 80 | Inez Chadwick | 47 | Wife | Proprietor | Iowa |
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)