MC
Mary Crawford — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Mary Crawford across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 7-person household.
Age 42
b. ~1898
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Crawford |
| Given Name | Mary L. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same House |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Frederick City |
| Est. Birth Year | ~1898 |
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 |
|---|---|---|---|---|
| Betty Crawford | Daughter | — | 17 | ~1923 |
| Walter Crawford | Head | — | 45 | ~1895 |
| John Crawford | Other | — | 1 | ~1939 |
| Emily Crawford | Other | — | 15 | ~1925 |
| John Crawford | Son | — | 20 | ~1920 |
| James Crawford | Son | — | 15 | ~1925 |
| Mary Crawford | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Frederick, Maryland
Spouse, age 21
Frederick, Maryland · implied b. ~1899 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Crawford |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Spouse, age 32
Frederick, Maryland · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Crawford |
| Given Name | Mary C |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 18 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Spouse, age 42
Frederick-County, Maryland · implied b. ~1898 — 7 household members
| Surname | Crawford |
| Given Name | Mary L. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| 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 Crawford across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Crawford
Spouse · 1940 · age 42 · b. ~1898 · 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 — Frederick-County, Maryland
Open full size
1940 US Federal Census — Frederick-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01548-00162)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rosaline Hiltner | 43 | Head | Laundress | Maryland |
| 2 | Donald H. Hiltner | 18 | Son | Clerk | Maryland |
| 3 | Helen M. Younkins | 32 | Head | Seamstress | Maryland |
| 4 | James D. Younkins | 12 | Son | — | Maryland |
| 5 | Charles D. Walls | 76 | Head | Butcher | Maryland |
| 6 | John W. Walls | 44 | Son | Butcher | Maryland |
| 7 | Nettie M. Mckenzie | 60 | Head | Seamstress | Maryland |
| 8 | Chester Mckenzie | 28 | Son | Laborer | Maryland |
| 9 | Rita S. Mckenzie | 25 | Daughter | House-Keeper | Maryland |
| 10 | Walter A. Crawford | 45 | Head | Painter | Maryland |
| 11 | Mary L. Crawford THIS PERSON | 42 | Wife | — | Maryland |
| 12 | Betty May Crawford | 17 | Daughter | Waitress | Maryland |
| 13 | James F. Crawford | 15 | Son | Delivery Boy | Maryland |
| 14 | John Edward Crawford | 20 | Son | Waiter | Maryland |
| 15 | Emily A. Crawford | 15 | Daughter-in-law | Laundress | Maryland |
| 16 | John E. Jr. Crawford | 1 | Grand-son | — | Maryland |
| 17 | Ida M. Cole | 64 | Head | House-Keeper | Pennsylvania |
| 18 | Calvin Sidle | 37 | Head | Laborer | Maryland |
| 19 | Margaret Sidle | 38 | Wife | — | Maryland |
| 20 | Calvin Jr. Sidle | 17 | Son | — | Maryland |
| 21 | Frank C. Nikirk | 26 | Head | Painter | Maryland |
| 22 | Margaret F. Nikirk | 26 | Wife | — | Maryland |
| 23 | Charles R. Nikirk | 9 | Son | — | Maryland |
| 24 | Mary Frances Nikirk | 4 | Daughter | — | Maryland |
| 25 | Glenn J. Jr. Nikirk | 28 | Head | Painter | Pennsylvania |
| 26 | Rose D. Nikirk | 28 | Wife | — | Maryland |
| 27 | Glenn L. Nikirk | 10 | Son | — | Maryland |
| 28 | Frank F. Nikirk | 8 | Son | — | Maryland |
| 29 | Welty E. Nikirk | 7 | Son | — | Maryland |
| 30 | Ronald D. Nikirk | 1 | Son | — | Maryland |
| 31 | George Burdette | 59 | Lodger | Truck Driver | Maryland |
| 32 | Ruth Husted | 27 | Lodger | — | Maryland |
| 33 | Doris J. Husted | 9 | Lodger | — | Maryland |
| 34 | Harry M. Stouffer | 51 | Head | Laborer | Maryland |
| 35 | Ella M. Stouffer | 43 | Wife | Laundress | Maryland |
| 36 | Milton Stouffer | 17 | Son | Clerk | Maryland |
| 37 | Ruth Stouffer | 15 | Daughter | — | Maryland |
| 38 | Paul F. Stouffer | 22 | Son | Laborer | Maryland |
| 39 | Constance D. Stouffer | 18 | Daughter-in-law | — | Virginia |
| 40 | Glenn R. Nikirk | 50 | Head | Painter | 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)