MN
Mary Nicholson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Nicholson across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 6-person household.
Age 14
b. ~1926
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1926 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Paul Nicholson | Head | — | 41 | ~1899 |
| Clifford Nicholson | Son | — | 11 | ~1929 |
| Delores Nicholson | Daughter | — | 4 | ~1936 |
| William Nicholson | Son | — | 13 | ~1927 |
| Mary Nicholson | Daughter | — | 14 | ~1926 |
| Helen Nicholson | Spouse | — | 35 | ~1905 |
Census Appearances
1930
Baltimore, Maryland
Other, age 3
Baltimore, Maryland · implied b. ~1927 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nicholson |
| Given Name | Margaret |
| Relationship to Head | Granddaughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 14
Baltimore-City-County, Maryland · implied b. ~1926 — 6 household members
| Surname | Nicholson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Class of Worker | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same house |
| 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 Nicholson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Nicholson
Daughter · 1940 · age 14 · b. ~1926 · Maryland
★ You are viewing this record
Sibling
Clifford Nicholson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Delores Nicholson
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Nicholson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01512-00762)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Frank Radd | 3 | Daughter | — | Maryland |
| 42 | Beulah Glynn | 14 | Lodger | — | Maryland |
| 43 | Mary Katherine Radd | 2 | Daughter | — | Maryland |
| 44 | Lindsay Coleman | 36 | Head | Shipping Clerk | Virginia |
| 45 | Bertha Green | 30 | Lodger | Maid | Maryland |
| 46 | David Gardner | 27 | Lodger | Laborer | North Carolina |
| 47 | Alice Gardner | 30 | Lodger | Maid | Virginia |
| 48 | Fannie Waters | 32 | Lodger | Maid | Virginia |
| 49 | Inez Waters | 11 | Daughter | — | Maryland |
| 50 | John Trotter | 60 | Head | Junking | Virginia |
| 51 | Arthur Harvey | 29 | Lodger | Laborer | Virginia |
| 52 | Pearl Harvey | 28 | Lodger | Helper | Virginia |
| 53 | Mary Harvey | 11 | Daughter | — | Virginia |
| 54 | George Harvey | 6 | Son | — | Maryland |
| 55 | Ella Harvey | 4 | Daughter | — | Maryland |
| 56 | Dorothy Harvey | 3 | Daughter | — | Maryland |
| 57 | D Whither | 34 | Brother | Laborer | Virginia |
| 58 | Paul Nicholson | 41 | Head | Laborer | North Carolina |
| 59 | Helen Nicholson | 35 | Wife | — | North Carolina |
| 60 | Mary Nicholson THIS PERSON | 14 | Daughter | — | Maryland |
| 61 | William Nicholson | 13 | Son | — | Maryland |
| 62 | Clifford Nicholson | 11 | Son | — | Maryland |
| 63 | Delores Nicholson | 4 | Daughter | — | Maryland |
| 64 | William E Johnson | 45 | Head | Porter | Maryland |
| 65 | Eva Johnson | 40 | Wife | — | Maryland |
| 66 | Annie L Stokes | 39 | Lodger | Maid | Virginia |
| 67 | Robert L Walker | 34 | Lodger | Laborer | Virginia |
| 68 | Henry Royal | 63 | Head | Laborer | Virginia |
| 69 | Ada Royal | 62 | Wife | — | Virginia |
| 70 | Edward Sheppard | 23 | Head | Laboratory Helper | Maryland |
| 71 | Clara Sheppard | 31 | Wife | — | Maryland |
| 72 | Jesse E Smith | 34 | Head | Hospital Porter | North Carolina |
| 73 | Odelia Smith | 31 | Wife | House Maid | Virginia |
| 74 | Charles Jordan | 38 | Head | Laborer | Virginia |
| 75 | Eunice Jordan | 35 | Wife | Maid | Virginia |
| 76 | Charles B Jordan | 19 | Son | Scraper | Virginia |
| 77 | Florence Jordan | 17 | Daughter | Maid | Virginia |
| 78 | Nellie Mae Jordan | 15 | Daughter | — | Virginia |
| 79 | Winnie Jane Brown | 28 | Sister-in-law | Maid | Virginia |
| 80 | Geraldine Brown | 11 | Niece | — | 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)