JH
John Hammond — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Delaware-County, Pennsylvania
Our Model Tree links this John Hammond across the 1920, 1930 and 1940 US Censuses in Delaware-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1865), then head of a 3-person household.
Age 75
b. ~1865
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Delaware-County, Pennsylvania |
| Surname | Hammond |
| Given Name | John T. B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 75 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Darby Twp. |
| 1935 Residence (County) | Delaware |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Darby Twp |
| Est. Birth Year | ~1865 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Emma Spriggs | Daughter | — | 43 | ~1897 |
| John Hammond | Head | — | 75 | ~1865 |
| Martha Hammond | Spouse | — | 69 | ~1871 |
Census Appearances
1920
Delaware, Pennsylvania
Head, age 50
Delaware, Pennsylvania · implied b. ~1870 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hammond |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 50 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Laborer |
| Industry | Shipyard |
| Class of Worker | W |
| Can Read | No |
| Can Write | No |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Delaware, Pennsylvania
Head, age 65
Delaware, Pennsylvania · implied b. ~1865 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hammond |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 21 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Laborer |
| Industry | Soap factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2500 |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Delaware-County, Pennsylvania
Head, age 75
Delaware-County, Pennsylvania · implied b. ~1865 — 3 household members
| Surname | Hammond |
| Given Name | John T. B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 75 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Darby Twp. |
| 1935 Residence (County) | Delaware |
| Highest Grade | No 5 |
| 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 John Hammond across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Hammond
Head · 1940 · age 75 · b. ~1865 · Pennsylvania
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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 — Delaware-County, Pennsylvania
Open full size
1940 US Federal Census — Delaware-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03491-00037)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Horace Boyd | 21 | Head | Waiter | Pennsylvania |
| 42 | Wilbert Boyd | 20 | Son | Bus Boy | Pennsylvania |
| 43 | Paul Hadden | 37 | Head | Police Officer | Pennsylvania |
| 44 | Ruth Hadden | 37 | Wife | Domestic Work | Pennsylvania |
| 45 | Margaret Hall | 34 | Sister | Laborer | Pennsylvania |
| 46 | William Hall | 17 | Nephew | — | Pennsylvania |
| 47 | Joseph Hall | 13 | Nephew | — | Pennsylvania |
| 48 | Lelia Gates | 64 | Head | Homework | Virginia |
| 49 | Isabelle Crocker | 54 | Cousin | Day'S Work | Virginia |
| 50 | Monroe Griffin | 27 | Head | Laborer | Maryland |
| 51 | Blanche Griffin | 20 | Wife | — | Pennsylvania |
| 52 | Barbara Griffin | 2 | Daughter | — | Pennsylvania |
| 53 | Monroe Griffin | 1 | Son | — | Pennsylvania |
| 54 | William Gale | 27 | Head | Laborer | Pennsylvania |
| 55 | Juanita Gale | 21 | Wife | — | Pennsylvania |
| 56 | Dorothy Gale | 4 | Daughter | — | Pennsylvania |
| 57 | Benjamin Mayo | 75 | Head | — | South Carolina |
| 58 | Isabelle Mayo | 60 | Wife | Laborer | South Carolina |
| 59 | Samuel Mayo | 20 | Son | New Worker | Pennsylvania |
| 60 | Elijah Dennis | 17 | Grand-son | — | Pennsylvania |
| 61 | Ruth Dennis | 16 | Grand-dau | — | Pennsylvania |
| 62 | Ernest Dennis | 15 | Grand-son | — | Pennsylvania |
| 63 | Dorothy Dennis | 15 | Grand-dau | — | Pennsylvania |
| 64 | Massie Dennis | 12 | Grand-son | — | Pennsylvania |
| 65 | Lillian Dennis | 10 | Daughter | — | Pennsylvania |
| 66 | William Madison | 70 | Head | — | Virginia |
| 67 | Jennie Madison | 67 | Wife | — | Ohio |
| 68 | John T. B. Hammond THIS PERSON | 75 | Head | — | Maryland |
| 69 | Martha Hammond | 69 | Wife | — | Maryland |
| 70 | Emma Spriggs | 43 | Daughter | Clerk | Maryland |
| 71 | Raymond Ledbetter | 42 | Head | — | Virginia |
| 72 | Lillian Ledbetter | 42 | Wife | — | Virginia |
| 73 | Barbara Ledbetter | 22 | Daughter | — | Maryland |
| 74 | Raymond Ledbetter | 20 | Son | — | Pennsylvania |
| 75 | Olga Ledbetter | 15 | Daughter | — | Pennsylvania |
| 76 | Gladys Ledbetter | 10 | Daughter | — | Pennsylvania |
| 77 | Lillian Ledbetter | 8 | Daughter | — | Pennsylvania |
| 78 | Walker Ledbetter | 4 | Son | — | Pennsylvania |
| 79 | George Cooper | 57 | Head | Pastor | Maryland |
| 80 | Jennie Cooper | 50 | Wife | Day'S Work | Virginia |
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)