MS
Mary Simms — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Simms across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 15-person household.
Age 12
b. ~1928
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Simms |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1928 |
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.
15 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| James Simms | Head | — | 45 | ~1895 |
| Dorothy Simms | Daughter | — | 16 | ~1924 |
| Mary Simms | Daughter | — | 12 | ~1928 |
| Geraldine Simms | Daughter | — | 9 | ~1931 |
| David Simms | Son | — | 18 | ~1922 |
| Theodosia Simms | Daughter | — | 6 | ~1934 |
| Hubert Addison | Other | — | 23 | ~1917 |
| Stephen Simms | Son | — | 3 | ~1937 |
| Mary Simms | Spouse | — | 43 | ~1897 |
| Matilda Simms | Daughter | — | 10 | ~1930 |
| Mildred Simms | Daughter | — | 22 | ~1918 |
| Margaret Addison | Daughter | — | 22 | ~1918 |
| Benjamin Simms | Son | — | 8 | ~1932 |
| James Simms | Son | — | 21 | ~1919 |
| Robert Simms | Son | — | 4 | ~1936 |
Census Appearances
1930
Baltimore, Maryland
Daughter, age 3
Baltimore, Maryland · implied b. ~1927 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sims |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| 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 12
Baltimore-City-County, Maryland · implied b. ~1928 — 15 household members
| Surname | Simms |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | No 8 |
| 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 Simms across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Simms
Daughter · 1940 · age 12 · b. ~1928 · Maryland
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Sibling
Mildred Simms
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Simms
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Simms
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Benjamin Simms
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Geraldine Simms
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stephen Simms
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Simms
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Matilda Simms
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Simms
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theodosia Simms
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Addison
Sibling · 1940 · age 22
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-t0627-01523-00230)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert Major | 26 | Head | Laborer | Maryland |
| 42 | Donald Major | 24 | Son | Laborer | Maryland |
| 43 | Nellemenia Major | 20 | Grandson | Laborer | Maryland |
| 44 | Donald Jr Major | 2 | Grandson | New Worker | Maryland |
| 45 | James Simms | 45 | Head | Acetelene Burner | Maryland |
| 46 | Mary Simms | 43 | Wife | — | Maryland |
| 47 | Mildred Simms | 22 | Daughter | Seamstress | Maryland |
| 48 | James Jr Simms | 21 | Son | Laborer | Maryland |
| 49 | David Simms | 18 | Son | Cleaner | Maryland |
| 50 | Dorothy Simms | 16 | Daughter | — | Maryland |
| 51 | Mary Simms THIS PERSON | 12 | Daughter | — | Maryland |
| 52 | Matilda Simms | 10 | Daughter | — | Maryland |
| 53 | Geraldine Simms | 9 | Daughter | — | Maryland |
| 54 | Benjamin Simms | 8 | Son | — | Maryland |
| 55 | Theodosia Simms | 6 | Daughter | — | Maryland |
| 56 | Robert Simms | 4 | Son | — | Maryland |
| 57 | Stephen Simms | 3 | Son | — | Maryland |
| 58 | Hubert Addison | 23 | Cousin | Delivery Man | Maryland |
| 59 | Margaret Addison | 22 | Daughter | — | Maryland |
| 60 | Samuel Lewis | 58 | Head | Bartender | North Carolina |
| 61 | Annie Lewis | 40 | Wife | — | Georgia |
| 62 | Julius Parola | 52 | Head | Evangelist | Virginia |
| 63 | Mildred Parola | 29 | Wife | Servant | Virginia |
| 64 | Theresa N Parola | 2 | Daughter | — | Maryland |
| 65 | Martha Brown | 52 | Head | Seamstress | Maryland |
| 66 | Charles Butler | 35 | Lodger | Laborer | North Carolina |
| 67 | Lavinia Dixon | 41 | Lodger | Servant | Maryland |
| 68 | Edna Foote | 46 | Head | Seamstress | Maryland |
| 69 | Lionel Foote | 15 | Son | New Worker | Maryland |
| 70 | William Montgomery | 29 | Head | Truck Driver | Maryland |
| 71 | Rosa Montgomery | 28 | Wife | — | Virginia |
| 72 | Jordan Montgomery | 14 | Son | — | Maryland |
| 73 | Deloris Montgomery | 9 | Daughter | — | Maryland |
| 74 | William Montgomery | 7 | Son | — | Maryland |
| 75 | Edward Parker | 31 | Head | Chauffeur | Virginia |
| 76 | Grace Parker | 29 | Wife | Maid | Virginia |
| 77 | Milton Clark | 28 | Head | Stevedore | West Virginia |
| 78 | Gaythrie Clark | 21 | Wife | — | Alabama |
| 79 | Lonnie Clark | 11 | Sister | — | Alabama |
| 80 | Roscoe Shamy | 40 | Lodger | Truck Driver | Maryland |
Related Census Records
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)