JM
James Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · District-Of-Columbia-County, District of Columbia
Our Model Tree links this James Mahoney across the 1920, 1930 and 1940 US Censuses in District-Of-Columbia-County, District of Columbia (XGBoost, ~Confirmed) — first a head (b.~1897), then head of a 11-person household.
Age 43
b. ~1897
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | District-Of-Columbia-County, District of Columbia |
| Surname | Mahoney |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | WASHINGTON |
| 1935 Residence (County) | District Of Columbia |
| Additional Details | |
| Occupation | Janitor |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 50 |
| Income (1939) | 720 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Janitor |
| Township / Ward | Washington |
| Est. Birth Year | ~1897 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| James Mahoney | Head | — | 43 | ~1897 |
| Patricia Mahoney | Daughter | — | 14 | ~1926 |
| Agnes Rogers | Other | — | 24 | ~1916 |
| Veronica Mahoney | Spouse | — | 42 | ~1898 |
| Liguori Mahoney | Son | — | 16 | ~1924 |
| Madeline Mahoney | Daughter | — | 18 | ~1922 |
| William Rogers | Other | — | 24 | ~1916 |
| Jr Mahoney | Son | — | 19 | ~1921 |
| Mary Barnes | Other | — | 31 | ~1909 |
| Thomas Barnes | Other | — | 33 | ~1907 |
| Emanuel Williams | Other | — | 57 | ~1883 |
Census Appearances
1920
District Of …
Head, age 32
District Of Columbia, District of Columbia · implied b. ~1888 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Janitor |
| Industry | Govt |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
None, District …
Head, age 38
None, District of Columbia · implied b. ~1892 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | James F |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 19 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Tire & Battery |
| Industry | Automobile |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 10500 |
| Radio Set | R |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
District-Of-Columbia-County, District …
Head, age 43
District-Of-Columbia-County, District of Columbia · implied b. ~1897 — 11 household members
| Surname | Mahoney |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | WASHINGTON |
| 1935 Residence (County) | District Of Columbia |
| Occupation | Janitor |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 50 |
| Income (1939) | 720 |
| Highest Grade | Hs 1 |
| 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 James Mahoney across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
James Mahoney
Head · 1940 · age 43 · b. ~1897 · District of Columbia
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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 — District-Of-Columbia-County, District of Columbia
Open full size
1940 US Federal Census — District-Of-Columbia-County, District of Columbia
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00553-00881)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Rosa Campbell | 27 | Lodger | Maid | Florida |
| 42 | Henrietta Jones | 25 | Lodger | Domestic | Florida |
| 43 | Faitie Williams | 40 | Lodger | Porter | Florida |
| 44 | Willie Mae Williams | 28 | Lodger | Domestic | Florida |
| 45 | James A. Craig | 56 | Head | Washman | South Carolina |
| 46 | David S. Craig | 34 | Son | Pastor | South Carolina |
| 47 | Jena Craig | 34 | Daughter-in-law | — | South Carolina |
| 48 | Effie Craig | 14 | Grand-daughter | — | South Carolina |
| 49 | Daisy L. Craig | 13 | Grand-daughter | — | D.C. |
| 50 | Annie M. Craig | 12 | Grand-daughter | — | D.C. |
| 51 | Florence Wood | 40 | Lodger | Domestic | North Carolina |
| 52 | Mildred Wood | 11 | Lodger | — | D.C. |
| 53 | Wilfred Jones | 22 | Lodger | Laborer | North Carolina |
| 54 | Nora Williams | 36 | Head | Domestic | South Carolina |
| 55 | Oscar Goodwin | 24 | Son | Laborer | South Carolina |
| 56 | Stephen Goodwin | 23 | Son | Laborer | South Carolina |
| 57 | Eleanor Chavis | 38 | Lodger | Domestic | North Carolina |
| 58 | Luisees Jeffcoates | 32 | Lodger | Porter | South Carolina |
| 59 | Evangeline Jeffcoates | 33 | Lodger | Domestic | Virginia |
| 60 | Marie Owens | 26 | Lodger | Domestic | Maryland |
| 61 | James Mahoney THIS PERSON | 43 | Head | Janitor | Maryland |
| 62 | Veronica Mahoney | 42 | Wife | Domestic | Mississippi |
| 63 | Jr. James Mahoney | 19 | Son | — | D.C. |
| 64 | Madeline Mahoney | 18 | Daughter | — | D.C. |
| 65 | Liguori Mahoney | 16 | Son | — | D.C. |
| 66 | Patricia Mahoney | 14 | Daughter | — | D.C. |
| 67 | Emanuel Williams | 57 | Lodger | Laborer | Maryland |
| 68 | William Rogers | 24 | Lodger | Laborer | South Carolina |
| 69 | Agnes Rogers | 24 | Lodger | — | D.C. |
| 70 | Thomas Barnes | 33 | Lodger | Laborer | D.C. |
| 71 | Mary Barnes | 31 | Lodger | Domestic | Maryland |
| 72 | Carrie Walker | 59 | Head | Messenger | D.C. |
| 73 | Regina Mahoney | 20 | Lodger | Housekeeper | D.C. |
| 74 | David Stroy | 42 | Head | Pastor | South Carolina |
| 75 | Mary Stroy | 38 | Wife | — | South Carolina |
| 76 | Mitchell Stroy | 18 | Son | — | South Carolina |
| 77 | Jr. David Stroy | 12 | Son | — | D.C. |
| 78 | Rose Stroy | 16 | Daughter | — | South Carolina |
| 79 | John Stroy | 24 | Brother | Laborer | South Carolina |
| 80 | Mary L. Stroy | 21 | Sister in law | — | South Carolina |
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)