HC
Harry Clark — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Diego-County, California
Our Model Tree links this Harry Clark across the 1920, 1930 and 1940 US Censuses in San-Diego-County, California (XGBoost, ~Confirmed), with identified parents Harry & Caroline — first a son (b.~1918), then head of a 3-person household.
Age 22
b. ~1918
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Diego-County, California |
| Surname | Clark |
| Given Name | Harry A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | City San Diego |
| 1935 Residence (County) | San Diego |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | City San Diego |
| Est. Birth Year | ~1918 |
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 Harry | Age | Birth yr |
|---|---|---|---|---|
| Caroline Clark | Head | — | 65 | ~1875 |
| Stella Thayer | Other | — | 66 | ~1874 |
| Harry Clark | Son | — | 22 | ~1918 |
Census Appearances
1920
San Diego, …
Son, age 2
San Diego, California · implied b. ~1918 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Canada |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Diego, …
Son, age 12
San Diego, California · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Harry Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Canada-English |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Diego-County, California
Son, age 22
San-Diego-County, California · implied b. ~1918 — 3 household members
| Surname | Clark |
| Given Name | Harry A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | City San Diego |
| 1935 Residence (County) | San Diego |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Harry Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Harry Clark (~0.92 confidence) and mother Caroline Clark (~0.92 confidence) and mother Caroline Clark (~0.92 confidence) and mother Caroline Clark (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harry Clark
b. ~1865
Source father
● Household
· direct · ~0.92
Mother
Caroline Clark
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Caroline Clark
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Caroline Clark
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Clark
Son · 1940 · age 22 · b. ~1918 · California
★ 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 — San-Diego-County, California
Open full size
1940 US Federal Census — San-Diego-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00453-00545)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Clarence White | 34 | Head | Manager | Illinois |
| 42 | Rachael White | 28 | Wife | Waitress | Canada |
| 43 | Mertice White | 8 | Daughter | — | Illinois |
| 44 | John White | 26 | Brother | Three Workers | Illinois |
| 45 | Caroline R. Clark | 65 | Head | — | Canada |
| 46 | Harry A. Clark THIS PERSON | 22 | Son | — | California |
| 47 | Stella A. Thayer | 66 | Roomer | — | New York |
| 48 | Columbus Monk | 56 | Head | Barber | Texas |
| 49 | Zelma Monk | 60 | Wife | — | Texas |
| 50 | Benjamin Cobb | 29 | Head | Ship Fitter | Indiana |
| 51 | Vera Cobb | 32 | Wife | — | Russia |
| 52 | Mildred Cobb | 6 | Daughter | — | California |
| 53 | Ray S. Burner | 50 | Head | Printing | Minnesota |
| 54 | Marguerite Burner | 45 | Wife | — | Minnesota |
| 55 | Feldon Burner | 19 | Son | Ushering | Minnesota |
| 56 | Ed. Mace | 63 | Uncle | — | Missouri |
| 57 | Anna Mace | 65 | Aunt | — | Minnesota |
| 58 | James H. Loftus | 27 | Head | Meat Cutter | New Mexico |
| 59 | Arvilla Loftus | 35 | Wife | Stenographer | Michigan |
| 60 | Bruce Griffin | 31 | Head | Mate | Florida |
| 61 | Effie Griffin | 26 | Wife | — | Maryland |
| 62 | Billy Griffin | 6 | Son | — | California |
| 63 | Joann Griffin | 4 | Daughter | — | Maryland |
| 64 | Glen Hayes | 31 | Head | Truck Driving | Colorado |
| 65 | Mary Hayes | 25 | Wife | — | Colorado |
| 66 | Mary Lou Hayes | 0 | Daughter | — | California |
| 67 | Reuel Hardesty | 48 | Head | — | Iowa |
| 68 | Reitz Hardesty | 45 | Wife | — | Iowa |
| 69 | Melle Hardesty | 39 | Sister | Secretary | Iowa |
| 70 | John O. Hardesty | 80 | Father | — | Sweden |
| 71 | Clarence Patterson | 27 | Head | Metal Smith | Iowa |
| 72 | Margaret Patterson | 20 | Wife | — | Arizona |
| 73 | Jan Alice Patterson | 2 | Daughter | — | California |
| 74 | Holly Ann Patterson | 0 | Daughter | — | California |
| 75 | Quilla Mcclard | 47 | Head | — | Missouri |
| 76 | Gladys Mcclard | 37 | Wife | Telephone Operator | Iowa |
| 77 | Donald Mcclard | 14 | Son | — | California |
| 78 | Carlton Nerrick | 64 | Head | Watch Maker | Minnesota |
| 79 | Gertrude Nerrick | 59 | Wife | — | Missouri |
| 80 | — | None | — | — | — |
Related Census Records
Pedigree Summary
Harry
Gen 1 · 4 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)