MC
Mary Campbell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · District-Of-Columbia-County, District of Columbia
Our Model Tree links this Mary Campbell across the 1920, 1930 and 1940 US Censuses in District-Of-Columbia-County, District of Columbia (XGBoost, ~Confirmed) — first a head (b.~1873), then head of a 4-person household.
Age 67
b. ~1873
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | District-Of-Columbia-County, District of Columbia |
| Surname | Campbell |
| Given Name | Mary M. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Washington D.C. |
| 1935 Residence (County) | District Of Columbia |
| Naturalization Status | First papers filed |
| Additional Details | |
| Occupation | Housework |
| Industry | private home |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 30 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Housework |
| Township / Ward | Washington Dc |
| Est. Birth Year | ~1873 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Campbell | Head | — | 67 | ~1873 |
| Michael Welsh | Other | — | 80 | ~1860 |
| Margaret Gordon | Other | — | 65 | ~1875 |
| Earl Campbell | Son | — | 45 | ~1895 |
Census Appearances
1920
None, District …
Other, age 45
None, District of Columbia · implied b. ~1875 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Margaret |
| Relationship to Head | Servant |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Single |
| Birthplace | Ireland |
| Year of Immigration | 1900 |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Servant |
| Industry | Private family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
None, District …
Other, age 54
None, District of Columbia · implied b. ~1876 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Campbell |
| Given Name | Mary |
| Relationship to Head | Sister |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1900 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
District-Of-Columbia-County, District …
Head, age 67
District-Of-Columbia-County, District of Columbia · implied b. ~1873 — 4 household members
| Surname | Campbell |
| Given Name | Mary M. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Washington D.C. |
| 1935 Residence (County) | District Of Columbia |
| Naturalization Status | First papers filed |
| Occupation | Housework |
| Industry | private home |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 30 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Mary Campbell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Campbell
Head · 1940 · age 67 · b. ~1873 · District of Columbia
★ 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 — 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-t0627-00555-00617)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Blanche Williams | 41 | Head | Restaurant | No. Carolina |
| 42 | Geo. Powell | 35 | Brother | General Worker | No. Carolina |
| 43 | Melissa Powell | 23 | Sister | Worker | No. Carolina |
| 44 | Tom Powell | 17 | Nephew | — | Wash. D.C. |
| 45 | Blanche Dickens | 33 | Sister | General Worker | No. Carolina |
| 46 | Willie Dickens | 5 | Nephew | — | No. Carolina |
| 47 | Pauline Pitman | 35 | Cousin | General Worker | No. Carolina |
| 48 | Lottie Brown | 37 | Roomer | Day Work | Virginia |
| 49 | Shirley Mae Brown | 10 | Roomer | — | Wash. D.C. |
| 50 | Robert Benson | 34 | Roomer | Landscape Work | Virginia |
| 51 | James Hill | 63 | Head | Worker | Virginia |
| 52 | Camilla Dupree | 14 | Cousin | — | Virginia |
| 53 | Paggie Fleen | 48 | Cousin | Worker | Virginia |
| 54 | Addie Bell Beaks | 22 | Cousin | Worker | Penna. |
| 55 | Mary Frances Beaks | 4 | Cousin | — | Penna. |
| 56 | Clarence Jackson | 40 | Cousin | Automobile Worker | Maryland |
| 57 | Jennie Bee Jackson | 38 | Cousin-in-law | Part Time Work | No. Carolina |
| 58 | Clarence L. Penn | 15 | Guest | Farm Hand | Wash. D.C. |
| 59 | Daniel Penn | 20 | Guest | Part Time Work | Penna. |
| 60 | — | None | — | — | — |
| 61 | Isaac Cymes | 43 | Head | Owner & Run | Poland |
| 62 | Libby Cymes | 48 | Wife | Helper In Store | Poland |
| 63 | Thomas J. Kay | 58 | Head | Fireman | Ireland |
| 64 | Mary E. Kay | 49 | Wife | — | Kansas |
| 65 | William J. Kay | 27 | Daughter | Stat. Clerk | Wash. D.C. |
| 66 | Edna F. Kay | 25 | Daughter | Nurse | Wash. D.C. |
| 67 | William V. Kay | 23 | Son | Clerk | Wash. D.C. |
| 68 | Edw. Barteman | 45 | Helper | Laborer | Kansas |
| 69 | Mary M. Campbell THIS PERSON | 67 | Head | Housework | Ireland |
| 70 | Earl Campbell | 45 | Son | — | Wash. D.C. |
| 71 | Michael Welsh | 80 | Roomer | Watchman | Ireland |
| 72 | Margaret Gordon | 65 | Sister | House Worker | Ireland |
| 73 | Mary E. Saunders | 46 | Head | House Worker | Virginia |
| 74 | Phyllis Hayes Saunders | 4 | Son | — | Wash. D.C. |
| 75 | Samuel Saunders | 16 | Son | — | Wash. D.C. |
| 76 | Royal Wm. Saunders | 15 | Son | — | Wash. D.C. |
| 77 | Louis Brown | 45 | Roomer | Laborer | Virginia |
| 78 | Evelyn Brown | 40 | Roomer | Part Time Work | Virginia |
| 79 | Patrick Murphy | 83 | Head | Notary Public | Ireland |
| 80 | Charles Malone | 75 | Head | Barber | 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)