MJ
Mary Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · District-Of-Columbia-County, District of Columbia
Our Model Tree links this Mary Johnson across the 1910, 1920, 1930 and 1940 US Censuses in District-Of-Columbia-County, District of Columbia (XGBoost, ~Confirmed) — first a head (b.~1869), then head of a 3-person household.
Age 71
b. ~1869
Female
Head
Born: Maryland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | District-Of-Columbia-County, District of Columbia |
| Surname | Johnson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| 1935 Residence (City) | Washington |
| 1935 Residence (County) | District Of Columbia |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Washington |
| Est. Birth Year | ~1869 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Myra Johnson | Daughter | — | 33 | ~1907 |
| Mary Johnson | Head | — | 71 | ~1869 |
| Florence Johnson | Son | — | 39 | ~1901 |
Census Appearances
1910
None, District …
Spouse, age 38
None, District of Columbia · implied b. ~1872 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Maryland |
| Years Married | 14 |
| Children Born | 0 |
| Children Living | 0 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Alabama |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1920
Washington, District …
Spouse, age 49
Washington, District of Columbia · implied b. ~1871 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 49 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Foreman |
| Industry | Gov't Em |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
District Of …
Head, age 59
District Of Columbia, District of Columbia · implied b. ~1871 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| Age at First Marriage | 13 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 25 |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
District-Of-Columbia-County, District …
Head, age 71
District-Of-Columbia-County, District of Columbia · implied b. ~1869 — 3 household members
| Surname | Johnson |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| 1935 Residence (City) | Washington |
| 1935 Residence (County) | District Of Columbia |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 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 Mary Johnson across 4 US Census years (1910, 1920, 1930 and 1940) in 4 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Johnson
Head · 1940 · age 71 · b. ~1869 · 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-t0627-00565-00462)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Donato Campanero | 44 | Head | Rodman | Italy |
| 42 | Dolores Campanero | 40 | Wife | — | Pennsylvania |
| 43 | Dominick Campanero | 19 | Son | Salesman | Pennsylvania |
| 44 | Chester Gray | 28 | Head | Tile-Setter | D. C. |
| 45 | Anna D. Gray | 21 | Wife | — | Virginia |
| 46 | Evelyn F. Gray | 3 | Daughter | — | Virginia |
| 47 | Joseph E. Vila | 71 | Head | — | Italy |
| 48 | Nicholas E. Vila | 22 | Son | Iron Worker | D. C. |
| 49 | James Chamoulos | 45 | Son-in-law | Counter Man | Greece |
| 50 | Rose Chamoulos | 41 | Daughter | — | D. C. |
| 51 | Helena Chamoulos | 17 | Granddaughter | Clerk | D. C. |
| 52 | James J. Chamoulos | 16 | Grandson | — | D. C. |
| 53 | Kathryn Chamoulos | 14 | Granddaughter | — | D. C. |
| 54 | Dorothy Chamoulos | 13 | Granddaughter | — | D. C. |
| 55 | Mary J. Chamoulos | 12 | Granddaughter | — | D. C. |
| 56 | Vivian Chamoulos | 10 | Granddaughter | — | D. C. |
| 57 | Frank Chamoulos | 8 | Grandson | — | D. C. |
| 58 | John E. Carter | 55 | Head | Electric Craneman | Virginia |
| 59 | Rosa O. Carter | 71 | Wife | — | Virginia |
| 60 | Charles A. Francis | 24 | Grandson | Electrician | Pennsylvania |
| 61 | James F. Mackin | 44 | Lodger | Trainman | Maryland |
| 62 | Thomas W. Dawson | 38 | Lodger | Brakeman | Virginia |
| 63 | Carl White | 26 | Lodger | Bricklayer | Tennessee |
| 64 | John White | 24 | Lodger | Bricklayer | Tennessee |
| 65 | George H. Chace | 77 | Head | Watchmaker | New York |
| 66 | Maggie S. Chace | 72 | Wife | — | Virginia |
| 67 | Mary E. Myers | 60 | Niece | Operator | Virginia |
| 68 | Clarence L. Aylor | 39 | Lodger | Sales Manager | Virginia |
| 69 | Jos. P. Kennedy | 52 | Head | Machinist | England |
| 70 | Theresa Kennedy | 74 | Wife | — | Austria |
| 71 | Donald Kennedy | 13 | Son | — | New York |
| 72 | Alexander Bell | 57 | Head | Attendant | Italy |
| 73 | Mary Bell | 60 | Wife | — | Italy |
| 74 | Helen Bell | 16 | Daughter | — | D. C. |
| 75 | Joseph Bell | 20 | Son | — | D. C. |
| 76 | Paul Bell | 21 | Son | — | D. C. |
| 77 | Mary Johnson THIS PERSON | 71 | Head | — | Maryland |
| 78 | Florence Johnson | 39 | Son | Salesman | D. C. |
| 79 | Myra Johnson | 33 | Daughter | — | D. C. |
| 80 | Extra Line | None | — | — | — |
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)