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John Simms — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Carroll-County, Maryland
Our Model Tree links this John Simms across the 1930 and 1940 US Censuses in Carroll-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 8-person household.
Age 12
b. ~1928
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Carroll-County, Maryland |
| Surname | Simms |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | C |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Mt Airy |
| 1935 Residence (County) | Carroll |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Mt Airy |
| 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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Simms | Son | — | 12 | ~1928 |
| John Simms | Head | — | 41 | ~1899 |
| Mary Simms | Spouse | — | 40 | ~1900 |
| Gloria Simms | Daughter | — | 13 | ~1927 |
| Charles Simms | Son | — | 17 | ~1923 |
| Rosy Simms | Daughter | — | 16 | ~1924 |
| Lucille Simms | Daughter | — | 15 | ~1925 |
| Elizabeth Simms | Daughter | — | 22 | ~1918 |
Census Appearances
1930
Carroll, Maryland
Other, age 2
Carroll, Maryland · implied b. ~1928 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Simms |
| Given Name | John D |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | Black |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Carroll-County, Maryland
Son, age 12
Carroll-County, Maryland · implied b. ~1928 — 8 household members
| Surname | Simms |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | C |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Mt Airy |
| 1935 Residence (County) | Carroll |
| Highest Grade | 5 |
| 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 John Simms across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Simms
Son · 1940 · age 12 · b. ~1928 · Maryland
★ You are viewing this record
Sibling
Charles Simms
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rosy Simms
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gloria Simms
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Simms
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lucille Simms
Sibling · 1940 · age 15
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 — Carroll-County, Maryland
Open full size
1940 US Federal Census — Carroll-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01544-01021)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leroy Hamberger | 7 | son | — | Virginia |
| 42 | Archie Hamberger | 5 | son | — | Maryland |
| 43 | Anthony Hamberger | 3 | son | — | Maryland |
| 44 | Anna Chaney | 13 | lodger | — | Maryland |
| 45 | William E. Fowler | 47 | head | Fireman | Maryland |
| 46 | Nora Fowler | 42 | wife | — | Maryland |
| 47 | Pearl Fowler | 18 | daughter | — | Maryland |
| 48 | Charles Fowler | 16 | son | — | Maryland |
| 49 | John Fowler | 13 | son | — | Maryland |
| 50 | Leroy Fowler | 10 | son | — | Maryland |
| 51 | Mary E. Fowler | 4 | daughter | — | Maryland |
| 52 | Robert Fowler | 1 | son | — | Maryland |
| 53 | William O. Moss | 53 | head | Farmer | Virginia |
| 54 | Essie D. Moss | 50 | wife | — | Virginia |
| 55 | William E. Moss | 19 | son | — | Virginia |
| 56 | Margaret M. Moss | 18 | daughter | — | Virginia |
| 57 | Benny Compton | 21 | laborer | Farm Laborer | Virginia |
| 58 | Fred S. Harrison | 44 | head | Farm Tenant | Maryland |
| 59 | Catherine Harrison | 37 | wife | — | Pennsylvania |
| 60 | Robert Harrison | 15 | son | — | Maryland |
| 61 | Helen Harrison | 13 | daughter | — | Maryland |
| 62 | Fred Jr. Harrison | 8 | son | — | Maryland |
| 63 | Frances Harrison | 5 | son | — | Maryland |
| 64 | Violet Will | 25 | lodger | — | Maryland |
| 65 | Thomas E. Harris | 68 | head | Farm Tenant | Virginia |
| 66 | Margaret Harris | 50 | wife | — | Virginia |
| 67 | Grenville Harris | 34 | son | — | Virginia |
| 68 | Margaret Harris | 18 | daughter | — | Virginia |
| 69 | Richard Harris | 16 | son | — | Virginia |
| 70 | Lewis Harris | 15 | son | — | Maryland |
| 71 | Virginia Harris | 12 | daughter | — | Maryland |
| 72 | Patton Hees | 73 | lodger | Farm Laborer | Virginia |
| 73 | John Simms | 41 | head | Farm Laborer | Maryland |
| 74 | Mary Simms | 40 | wife | — | Maryland |
| 75 | Elizabeth Simms | 22 | daughter | Farm Laborer | Maryland |
| 76 | Charles Simms | 17 | son | — | Maryland |
| 77 | Rosy Simms | 16 | daughter | — | Maryland |
| 78 | Lucille Simms | 15 | daughter | — | Maryland |
| 79 | Gloria Simms | 13 | daughter | — | Maryland |
| 80 | John Jr. Simms THIS PERSON | 12 | son | — | 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)