JC
James Carroll — 1940 US Census Record
Model Tree available1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this James Carroll across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed), with identified parents John & Mary — first a head (b.~1912), then head of a 5-person household.
Age 28
b. ~1912
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Carroll |
| Given Name | James H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | W.P.A. |
| Hours Worked | 40 |
| Income (1939) | 300 |
| Highest Grade | No 7 |
| 1935 Residence | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | W.P.A. |
| Township / Ward | Urbana Dist 7 |
| Est. Birth Year | ~1912 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Mary Carroll | Daughter | — | 3 | ~1937 |
| Hellen Carroll | Daughter | — | 1 | ~1939 |
| James Carroll | Head | — | 28 | ~1912 |
| James Carroll | Son | — | 4 | ~1936 |
| Cora Carroll | Spouse | — | 20 | ~1920 |
Census Appearances
1920
Frederick, Maryland
Son, age 8
Frederick, Maryland · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | James H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Son, age 18
Frederick, Maryland · implied b. ~1912 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | James H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Laborer |
| Industry | State Road |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Head, age 28
Frederick-County, Maryland · implied b. ~1912 — 5 household members
| Surname | Carroll |
| Given Name | James H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick |
| 1935 Residence (County) | Frederick |
| Occupation | W.P.A. |
| Hours Worked | 40 |
| Income (1939) | 300 |
| Highest Grade | No 7 |
| 1935 Residence | Maryland |
| 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 James Carroll across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Carroll (~0.92 confidence) and mother Mary Carroll (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Carroll
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Mary Carroll
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Carroll
Head · 1940 · age 28 · b. ~1912 · Maryland
★ You are viewing this record
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-t0627-01548-00804)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | James R. Williams | 60 | Head | Laborer | Virginia |
| 42 | Nellie F. Cooper | 33 | Housekeeper | Housework | Virginia |
| 43 | Paul E. Cooper | 11 | Lodger | — | Virginia |
| 44 | Leroy Cooper | 9 | Lodger | — | Virginia |
| 45 | Clara V. Cooper | 8 | Lodger | — | Virginia |
| 46 | Lloyd F. Cooper | 7 | Lodger | — | Virginia |
| 47 | Grace M. Virts | 48 | Head | Housework | Maryland |
| 48 | Harry L. Cosgrave | 57 | Head | Farmer | Maryland |
| 49 | Annie O. Cosgrave | 50 | Wife | Housewife | Maryland |
| 50 | Donald L. Cosgrave | 20 | Son | Laborer | Maryland |
| 51 | Perry C. Cosgrave | 18 | Son | Laborer | Maryland |
| 52 | James C. Cosgrave | 15 | Son | — | Maryland |
| 53 | Marion L. Cosgrave | 12 | Daughter | — | Maryland |
| 54 | Marian L. Cosgrave | 12 | Daughter | — | Maryland |
| 55 | Charles F. Crawford | 76 | Head | Retired | Maryland |
| 56 | Laura B. Crawford | 70 | Wife | Housewife | Maryland |
| 57 | Rossie T. Crawford | 48 | Son | Farmer | Maryland |
| 58 | Manzella M. Crawford | 36 | Daughter | — | Maryland |
| 59 | Edith C. Crawford | 34 | Daughter | Housework | Maryland |
| 60 | William E. Crawford | 38 | Son | Farmer | Maryland |
| 61 | Mildred L. Crawford | 25 | Daughter-in-law | Housewife | Maryland |
| 62 | William E. Jr. Crawford | 2 | Grandson | — | Maryland |
| 63 | Jesse C. Harrison | 37 | Head | Laborer | Virginia |
| 64 | Evelyn O. Harrison | 27 | Wife | Housewife | Virginia |
| 65 | Ollie E. Harrison | 9 | Son | — | Virginia |
| 66 | Walter T. Harrison | 7 | Son | — | Virginia |
| 67 | Vernice L. Harrison | 5 | Daughter | — | Virginia |
| 68 | Ruby Lee Harrison | 1 | Daughter | — | Maryland |
| 69 | Walter T. Harrison | 70 | Head | Laborer | Virginia |
| 70 | Lilly Lee Harrison | 69 | Wife | Housewife | Virginia |
| 71 | James H. Carroll THIS PERSON | 28 | Head | W.P.A. | Maryland |
| 72 | Cora F. Carroll | 20 | Wife | — | Maryland |
| 73 | James H. Jr. Carroll | 4 | Son | — | Maryland |
| 74 | Mary E. Carroll | 3 | Daughter | — | Maryland |
| 75 | Hellen E. Carroll | 1 | Daughter | — | Maryland |
| 76 | William T. Lee | 64 | Head | Laborer | Maryland |
| 77 | Katie C. Lee | 60 | Wife | Housewife | Maryland |
| 78 | Charles E. Lee | 22 | Son | Laborer | Maryland |
| 79 | Liza Jane Jones | 80 | Head | Retired | Maryland |
| 80 | V. Windsor Yingling | 34 | Head | Laborer | Maryland |
Pedigree Summary
James
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)