WM
William Mccormick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clinton-County, Iowa
Our Model Tree links this William Mccormick across the 1920, 1930 and 1940 US Censuses in Clinton-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1874), then head of a 5-person household.
Age 66
b. ~1874
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Clinton-County, Iowa |
| Surname | McCormick |
| Given Name | William J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Clinton City |
| Est. Birth Year | ~1874 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Robert Mccormick | Son | — | 22 | ~1918 |
| Alice Mccarthy | Other | — | 50 | ~1890 |
| William Mccormick | Head | — | 66 | ~1874 |
| Kathleen Mccormick | Daughter | — | 20 | ~1920 |
| Catherine Mccormick | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Clinton, Iowa
Head, age 45
Clinton, Iowa · implied b. ~1875 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | William J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Clinton, Iowa
Head, age 56
Clinton, Iowa · implied b. ~1874 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | William J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 43 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 8000 |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Clinton-County, Iowa
Head, age 66
Clinton-County, Iowa · implied b. ~1874 — 5 household members
| Surname | McCormick |
| Given Name | William J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Clinton City |
| 1935 Residence (County) | Clinton |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 William Mccormick across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
William Mccormick
Head · 1940 · age 66 · b. ~1874 · 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-t0627-01150-00446)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Agnes Young | 75 | Head | — | Canada English |
| 2 | Mary A Young | 39 | Daughter | Private Secretary | Iowa |
| 3 | Arthur S Fink | 75 | Head | Salesman | Illinois |
| 4 | Mary E Fink | 64 | Wife | — | Illinois |
| 5 | William T Welsh | 68 | Head | — | New York |
| 6 | Raymond J Judge | 32 | Son | Salesman | Iowa |
| 7 | Margaret M Judge | 32 | Daughter in law | — | Iowa |
| 8 | William J Cannon | 48 | Head | Telegraph Operator | Iowa |
| 9 | Lillian E Cannon | 50 | Wife | — | Iowa |
| 10 | Patrick Mckay | 81 | Head | — | Scotland |
| 11 | Anne Mckay | 76 | Wife | — | Pennsylvania |
| 12 | Edith G Mckay | 50 | Daughter | — | Iowa |
| 13 | Florence E Sugg | 57 | Head | — | Iowa |
| 14 | Leonard H Closs | 29 | Head | Mill-Rite | Iowa |
| 15 | Francis G Closs | 28 | Wife | — | Iowa |
| 16 | Donna Jean Closs | 10 | Daughter | — | Iowa |
| 17 | Lorraine M Closs | 8 | Daughter | — | Iowa |
| 18 | Marlene Joy Closs | 6 | Daughter | — | Iowa |
| 19 | William J Mccormick THIS PERSON | 66 | Head | — | Illinois |
| 20 | Catherine E Mccormick | 58 | Wife | — | Iowa |
| 21 | Robert L Mccormick | 22 | Son | — | Iowa |
| 22 | Kathleen Mccormick | 20 | Daughter | — | Iowa |
| 23 | Alice Mccarthy | 50 | Sister in law | Music Teacher | Iowa |
| 24 | John W Underwood | 58 | Head | Traveling Salesman | Illinois |
| 25 | Isabel Underwood | 53 | Wife | — | Illinois |
| 26 | Jean Underwood | 16 | Daughter | — | Iowa |
| 27 | Elizabeth A York | 81 | Head | — | Scotland |
| 28 | Norman J York | 49 | Son | Salesman | Iowa |
| 29 | Ann B Miller | 34 | Head | Telephone Clerk | Iowa |
| 30 | Frank Clark | 51 | Head | Engineer | Kansas |
| 31 | Mary B Clark | 58 | Wife | — | Wisconsin |
| 32 | Gordon E Flora | 30 | Head | Rigger | Nebraska |
| 33 | Mary G Flora | 20 | Wife | — | Virginia |
| 34 | Gordon E Jr Flora | 0 | Son | — | Virginia |
| 35 | Francis J Finch | 58 | Head | Clerk | Iowa |
| 36 | Clara E Finch | 56 | Wife | — | Pennsylvania |
| 37 | Robert J Finch | 20 | Son | Laborer | Iowa |
| 38 | Gloria E Finch | 16 | Daughter | — | Iowa |
| 39 | Frank H Dippo | 49 | Head | Brakeman | Minnesota |
| 40 | Agnes A Dippo | 40 | Wife | — | Iowa |
Related Census Records
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)