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Harry Hamilton — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Harry Hamilton across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1896), then head of a 4-person household.
Age 44
b. ~1896
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Hamilton |
| Given Name | Harry L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Part Owner |
| Industry | Retail Grocery |
| Class of Worker | OA |
| Hours Worked | 72 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Part Owner |
| Township / Ward | Frederick City |
| Est. Birth Year | ~1896 |
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 Harry | Age | Birth yr |
|---|---|---|---|---|
| Harry Hamilton | Son | — | 11 | ~1929 |
| Barbara Hamilton | Daughter | — | 6 | ~1934 |
| Francis Hamilton | Spouse | — | 32 | ~1908 |
| Harry Hamilton | Head | — | 44 | ~1896 |
Census Appearances
1920
Frederick, Maryland
Other, age 22
Frederick, Maryland · implied b. ~1898 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Harry E. |
| Relationship to Head | Brother |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Other, age 33
Frederick, Maryland · implied b. ~1897 — 26 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Henry |
| Sex | M |
| Color / Race | Black |
| Age | 33 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Head, age 44
Frederick-County, Maryland · implied b. ~1896 — 4 household members
| Surname | Hamilton |
| Given Name | Harry L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Occupation | Part Owner |
| Industry | Retail Grocery |
| Class of Worker | OA |
| Hours Worked | 72 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Hamilton across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Harry Hamilton
Head · 1940 · age 44 · b. ~1896 · Maryland
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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 — Frederick-County, Maryland
Open full size
1940 US Federal Census — Frederick-County, Maryland
Page Contents
15 people indexed on this census page (nara:1940:m-t0627-01548-00441)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mildred E Ford | 42 | Wife | — | Maryland |
| 42 | Francis M Ford | 17 | Daughter | — | Maryland |
| 43 | William J Ford | 8 | Son | — | Maryland |
| 44 | Hezekiah Ford | 88 | Father | — | Maryland |
| 45 | Mary M Ford | 84 | Mother | — | Maryland |
| 46 | Lasselle W Grove | 30 | Head | Sales Manager | Maryland |
| 47 | Hilda S Grove | 29 | Wife | — | Maryland |
| 48 | Nancy A Grove | 10 | Daughter | — | Maryland |
| 49 | Harry L Hamilton THIS PERSON | 44 | Head | Part Owner | Maryland |
| 50 | Francis P Hamilton | 32 | Wife | — | Maryland |
| 51 | Harry L Jr Hamilton | 11 | Son | — | Maryland |
| 52 | Barbara A Hamilton | 6 | Daughter | — | Maryland |
| 53 | Clarence G Stevens | 25 | Head | Agent | Maryland |
| 54 | Mildred R Stevens | 25 | Wife | — | Delaware |
| 55 | Sally A Stevens | 3 | Daughter | — | Maryland |
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)