JC
John Clark — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Clackamas-County, Oregon
Our Model Tree links this John Clark across the 1920, 1930 and 1940 US Censuses in Clackamas-County, Oregon (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 6-person household.
Age 51
b. ~1889
Male
Head
Born: Nebraska
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Clackamas-County, Oregon |
| Surname | Clark |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Nebraska |
| 1935 Residence (City) | Clackamas C.D. |
| 1935 Residence (County) | Clackamas |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
| Occupation | Farmer |
| Township / Ward | Clackamas Cd |
| Est. Birth Year | ~1889 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Joan Clark | Daughter | — | 8 | ~1932 |
| Harold Clark | Daughter | — | 16 | ~1924 |
| Margaret Clark | Daughter | — | 17 | ~1923 |
| John Clark | Head | — | 51 | ~1889 |
| James Clark | Son | — | 13 | ~1927 |
| Mable Clark | Spouse | — | 49 | ~1891 |
Census Appearances
1920
Clackamas, Oregon
Head, age 31
Clackamas, Oregon · implied b. ~1889 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | John D. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Nebraska |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Farmer |
| Industry | Truck |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1930
Clackamas, Oregon
Other, age 40
Clackamas, Oregon · implied b. ~1890 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | John L. |
| Relationship to Head | O |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Nebraska |
| Age at First Marriage | 21 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Radio Set | R |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
1940
Clackamas-County, Oregon
Head, age 51
Clackamas-County, Oregon · implied b. ~1889 — 6 household members
| Surname | Clark |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Nebraska |
| 1935 Residence (City) | Clackamas C.D. |
| 1935 Residence (County) | Clackamas |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Nebraska |
| Birth Country | United States |
| Birthplace (normalized) | nebraska |
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 John Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Clark
Head · 1940 · age 51 · b. ~1889 · Oregon
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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 — Clackamas-County, Oregon
Open full size
1940 US Federal Census — Clackamas-County, Oregon
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03354-00333)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Arnup | 53 | Wife | — | South Dakota |
| 2 | Stuart J. Arnup | 14 | Son | — | Washington |
| 3 | Nathan P. Johnson | 79 | Head | Farmer | Ohio |
| 4 | Guy R. Boyer | 38 | Head | Weaver | Indiana |
| 5 | Bernice M. Boyer | 30 | Wife | — | Washington |
| 6 | James A. Boyer | 13 | Son | — | California |
| 7 | Arthur Carson | 61 | Father in law | Labor. | Washington |
| 8 | Victor Conarroe | 64 | Head | Farmer | Ohio |
| 9 | Irene G. Conarroe | 50 | Wife | Teacher | Nebraska |
| 10 | John L. Clark THIS PERSON | 51 | Head | Farmer | Nebraska |
| 11 | Mable I. Clark | 49 | Wife | Stand | California |
| 12 | Margaret D. Clark | 17 | Daughter | — | Oregon |
| 13 | Harold Betty Clark | 16 | Daughter | — | Oregon |
| 14 | James L. Clark | 13 | Son | — | Oregon |
| 15 | Joan S. Clark | 8 | Daughter | — | Oregon |
| 16 | Clyde E. Blade | 32 | Head | Repairman | Missouri |
| 17 | Frances M. Blade | 32 | Wife | — | Kansas |
| 18 | Duane C. Blade | 8 | Son | — | Kansas |
| 19 | Delmer L. Blade | 5 | Son | — | Kansas |
| 20 | Hubert R. Steenerson | 29 | Head | Finish Carpenter | North Dakota |
| 21 | Clara G. Steenerson | 28 | Wife | — | North Dakota |
| 22 | John F. Mckelvey | 63 | Head | Unable To Work. | Ohio |
| 23 | Gladys Mckelvey | 39 | Wife | — | Washington |
| 24 | Eman A. Peterson | 36 | Head | Truck Driver | Wisconsin |
| 25 | Elizabeth Peterson | 34 | Wife | — | Missouri |
| 26 | Abner I. Frey | 56 | Head | Machinist | Michigan |
| 27 | Louisa F. Frey | 50 | Wife | — | Ohio |
| 28 | Harry V. Lawler | 37 | Head | Core Maker | Iowa |
| 29 | Marjorie V. Lawler | 35 | Wife | — | South Dakota |
| 30 | Hedwig Notz | 45 | Head | Farmer | Oregon |
| 31 | Delmar J. Updegrove | 82 | Head | Ill | Michigan |
| 32 | Emma S. Updegrove | 80 | Wife | — | Illinois |
| 33 | Seth L. Casto | 67 | Head | Farmer | Washington |
| 34 | Edith Casto | 63 | Wife | — | Oregon |
| 35 | Letha A. Deakins | 59 | Head | — | West Virginia |
| 36 | Ralph P. Deakins | 30 | Son | Farmer | Oregon |
| 37 | Harold I. Beach | 26 | Hand | Labor | Oregon |
| 38 | Robert F. Hanson | 19 | Hand | Labor | North Dakota |
| 39 | Le Grand J. Larson | 31 | Head | Glazer | Utah |
| 40 | Helen W. Larson | 27 | Wife | — | Oregon |
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)