MS
Mary Shaffer — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-County, Maryland
Our Model Tree links this Mary Shaffer across the 1930 and 1940 US Censuses in Baltimore-County, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1892), then head of a 7-person household.
Age 48
b. ~1892
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-County, Maryland |
| Surname | Shaffer |
| Given Name | Mary B. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Falls Road |
| 1935 Residence (County) | Baltimore |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Falls Road |
| Est. Birth Year | ~1892 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Isaac Shaffer | Head | — | 56 | ~1884 |
| Mary Shaffer | Daughter | — | 15 | ~1925 |
| Lydia Shaffer | Daughter | — | 21 | ~1919 |
| H Shaffer | Daughter | — | 11 | ~1929 |
| Lewis Shaffer | Son | — | 20 | ~1920 |
| Ellen Shaffer | Daughter | — | 21 | ~1919 |
| Mary Shaffer | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Baltimore, Maryland
Other, age 38
Baltimore, Maryland · implied b. ~1892 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Shaffer |
| Given Name | Mary B. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 18 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-County, Maryland
Spouse, age 48
Baltimore-County, Maryland · implied b. ~1892 — 7 household members
| Surname | Shaffer |
| Given Name | Mary B. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Falls Road |
| 1935 Residence (County) | Baltimore |
| Class of Worker | 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 Shaffer across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Shaffer
Spouse · 1940 · age 48 · b. ~1892 · Maryland
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Baltimore-County, Maryland
Open full size
1940 US Federal Census — Baltimore-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01504-00257)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | George R. Nash | 37 | Son | Carpenter | Maryland |
| 42 | C. Carroll Nash | 43 | Head | Farmer | Maryland |
| 43 | Irma M. Nash | 40 | Wife | — | Maryland |
| 44 | Arthur C. Nash | 17 | Son | Farm Laborer | Maryland |
| 45 | Charles L. Nash | 9 | Son | — | Maryland |
| 46 | Susie S. Nash | 67 | Mother | — | Maryland |
| 47 | S. Paul Liggard | 48 | Hired hand | Farm Laborer | Maryland |
| 48 | Walter R. Demoss | 52 | Head | Farmer | Maryland |
| 49 | Myrtle C. Demoss | 49 | Wife | — | Maryland |
| 50 | Walter J. Demoss | 22 | Son | Farm Laborer | Maryland |
| 51 | Jeannette Demoss | 17 | Daughter | New Worker | Maryland |
| 52 | Isaac H. Shaffer | 56 | Head | Carpenter | Maryland |
| 53 | Mary B. Shaffer THIS PERSON | 48 | Wife | — | Maryland |
| 54 | Lydia Mae Shaffer | 21 | Daughter | — | Maryland |
| 55 | Ellen Rae Shaffer | 21 | Daughter | — | Maryland |
| 56 | Lewis H. Shaffer | 20 | Son | Carpenter Apprentice | Maryland |
| 57 | Mary B. Shaffer | 15 | Daughter | — | Maryland |
| 58 | H. Louisa D. Shaffer | 11 | Daughter | — | Maryland |
| 59 | Preston Shaffer | 28 | Head | Carpenter | Maryland |
| 60 | Mary Ruth Shaffer | 22 | Wife | — | Maryland |
| 61 | Dorothy R. Shaffer | 1 | Daughter | — | Maryland |
| 62 | Russell S. Martin | 34 | Head | Carpenter | Maryland |
| 63 | Hollie M. Martin | 29 | Wife | — | Maryland |
| 64 | Irvin Martin | 11 | Son | — | Maryland |
| 65 | Helen B. Martin | 7 | Daughter | — | Maryland |
| 66 | Daisy C. Palmer | 64 | Head | — | Maryland |
| 67 | Joshua Cofill | 80 | Head | Farmer | Maryland |
| 68 | Clara E. Cofill | 68 | Wife | — | Maryland |
| 69 | William S. Carr | 39 | Head | Proprietor | Maryland |
| 70 | Florence M. Carr | 37 | Wife | — | Maryland |
| 71 | W. Walter Carr | 16 | Son | — | Maryland |
| 72 | Robert L. Carr | 14 | Son | — | Maryland |
| 73 | Violet L. Carr | 13 | Daughter | — | Maryland |
| 74 | George L. Carr | 12 | Son | — | Maryland |
| 75 | William C. Miller | 69 | Head | Farmer | Maryland |
| 76 | Rosa Belle Miller | 66 | Wife | — | Maryland |
| 77 | Rachael R. Miller | 30 | Daughter | — | Maryland |
| 78 | William H. Ruby | 66 | Head | Laborer | Maryland |
| 79 | Cora E. Ruby | 66 | Wife | — | Maryland |
| 80 | Clarence Martin | 57 | Head | Farmer | 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)