MA
Mary Alexander — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Shelby-County, Alabama
Our Model Tree links this Mary Alexander across the 1930 and 1940 US Censuses in Shelby-County, Alabama (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 12-person household.
Age 12
b. ~1928
Female
Daughter
Born: Alabama
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Shelby-County, Alabama |
| Surname | Alexander |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Alabama |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Shelby |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Alabama |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
| Township / Ward | Election Precinct 13 |
| 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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Francis Alexander | Daughter | — | 4 | ~1936 |
| Ruth Alexander | Daughter | — | 7 | ~1933 |
| Martha Alexander | Daughter | — | 13 | ~1927 |
| Mary Alexander | Daughter | — | 12 | ~1928 |
| Sarah Alexander | Daughter | — | 10 | ~1930 |
| Adas Alexander | Head | — | 40 | ~1900 |
| James Jones | Other | — | 8 | ~1932 |
| Julius Alexander | Son | — | 21 | ~1919 |
| Jessie Alexander | Son | — | 9 | ~1931 |
| Benjamin Alexander | Son | — | 16 | ~1924 |
| Dumas Alexander | Son | — | 19 | ~1921 |
| Mims Alexander | Son | — | 17 | ~1923 |
Census Appearances
1930
Shelby, Alabama
Daughter, age 3
Shelby, Alabama · implied b. ~1927 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Alexander |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Alabama |
| Father's Birthplace | Alabama |
| Mother's Birthplace | Alabama |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
1940
Shelby-County, Alabama
Daughter, age 12
Shelby-County, Alabama · implied b. ~1928 — 12 household members
| Surname | Alexander |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Alabama |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Shelby |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 4 |
| 1935 Residence | Alabama |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
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 Alexander across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Alexander
Daughter · 1940 · age 12 · b. ~1928 · Alabama
★ You are viewing this record
Sibling
Mims Alexander
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sarah Alexander
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julius Alexander
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dumas Alexander
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Alexander
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Benjamin Alexander
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jessie Alexander
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Alexander
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ruth Alexander
Sibling · 1940 · age 7
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 — Shelby-County, Alabama
Open full size
1940 US Federal Census — Shelby-County, Alabama
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00079-00672)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alonzo D Cooper | 35 | Head | Fireman | Alabama |
| 2 | Lillie Cooper | 33 | Wife | — | Alabama |
| 3 | Hubert L Cooper | 14 | Son | — | Alabama |
| 4 | Alonzo Jr Cooper | 12 | Son | — | Alabama |
| 5 | Mary S Cooper | 10 | Daughter | — | Alabama |
| 6 | Lee M Drough | 65 | Head | — | Alabama |
| 7 | Mallie Drough | 64 | Wife | — | Alabama |
| 8 | Maud Frances Drough | 35 | Step daughter | Beautician | Alabama |
| 9 | Talmer D George | 37 | Head | Lime Roller | Alabama |
| 10 | Carrie George | 40 | Wife | Wash Woman | Alabama |
| 11 | Al Sykes | 52 | Head | Laborer | Mississippi |
| 12 | Virginia Sykes | 53 | Wife | — | Mississippi |
| 13 | Adas Alexander | 40 | Head | Laundry | Alabama |
| 14 | Julius Alexander | 21 | Son | Laborer | Alabama |
| 15 | Dumas Alexander | 19 | Son | Lime Roller | Alabama |
| 16 | Mims Alexander | 17 | Son | Laborer | Alabama |
| 17 | Benjamin Alexander | 16 | Son | — | Alabama |
| 18 | Martha Alexander | 13 | Daughter | — | Alabama |
| 19 | Mary Alexander THIS PERSON | 12 | Daughter | — | Alabama |
| 20 | Sarah Alexander | 10 | Daughter | — | Alabama |
| 21 | Jessie Alexander | 9 | Son | — | Alabama |
| 22 | Ruth Alexander | 7 | Daughter | — | Alabama |
| 23 | James Jones | 8 | Grandson | — | Alabama |
| 24 | Francis Alexander | 4 | Daughter | — | Alabama |
| 25 | M A Kendrick | 32 | Head | Bus Driver | Alabama |
| 26 | Rosa Kendrick | 25 | Wife | — | Alabama |
| 27 | Gayla W Kendrick | 1 | Daughter | — | Alabama |
| 28 | George S Stewart | 59 | Head | Farmer | Alabama |
| 29 | Valerie Stewart | 65 | Wife | — | Alabama |
| 30 | Frank F Ferrell | 53 | Head | Farmer | Alabama |
| 31 | Daisy Ferrell | 53 | Wife | — | Alabama |
| 32 | Robert Ferrell | 13 | Son | — | Alabama |
| 33 | Louise Ferrell | 11 | Daughter | — | Alabama |
| 34 | Charles Ferrell | 9 | Son | — | Alabama |
| 35 | Lizzie Lunsford | 42 | Head | — | Alabama |
| 36 | Frances Lunsford | 20 | Daughter | — | Alabama |
| 37 | Eugene Lunsford | 18 | Son | Soil Conservation | Alabama |
| 38 | Vada Thomas | 4 | Niece | — | Alabama |
| 39 | Joyce Ferrell | 3 | Grand Dau | — | Alabama |
| 40 | Gladys Allison | 20 | Niece | — | Alabama |
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)