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John Johns — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Montgomery-County, Maryland
Our Model Tree links this John Johns across the 1930 and 1940 US Censuses in Montgomery-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Maryland |
| Surname | Johns |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Olney |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Same Place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Olney |
| Est. Birth Year | ~1929 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Martha Johns | Daughter | — | 10 | ~1930 |
| Joan Johns | Daughter | — | 8 | ~1932 |
| James Johns | Son | — | 12 | ~1928 |
| Brooke Johns | Head | — | 46 | ~1894 |
| Jocelyn Johns | Daughter | — | 6 | ~1934 |
| John Johns | Son | — | 11 | ~1929 |
| Brooke Johns | Son | — | 15 | ~1925 |
| Amelia Johns | Other | — | 65 | ~1875 |
| Hazel Johns | Spouse | — | 32 | ~1908 |
Census Appearances
1930
Montgomery, Maryland
Son, age 1
Montgomery, Maryland · implied b. ~1929 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johns |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | District of Columbia |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Montgomery-County, Maryland
Son, age 11
Montgomery-County, Maryland · implied b. ~1929 — 9 household members
| Surname | Johns |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Olney |
| 1935 Residence (County) | Montgomery |
| 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 Johns across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Johns
Son · 1940 · age 11 · b. ~1929 · Maryland
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Sibling
Martha Johns
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jocelyn Johns
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Johns
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Brooke Johns
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Johns
Sibling · 1940 · age 8
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 — Montgomery-County, Maryland
Open full size
1940 US Federal Census — Montgomery-County, Maryland
Page Contents
32 people indexed on this census page (nara:1940:m-t0627-01554-00777)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Corbin N. Brown | 16 | Son | — | Maryland |
| 42 | Shirley A. Brown | 4 | Daughter | — | Maryland |
| 43 | Charles Oland | 25 | Head | Mechanic | Maryland |
| 44 | Gladys S. Oland | 25 | Wife | — | Maryland |
| 45 | Charles D. Oland | 3 | Son | — | Maryland |
| 46 | Lee Hawkins | 28 | Head | Clerk | Virginia |
| 47 | Helen S. Hawkins | 26 | Wife | — | Maryland |
| 48 | Samuel A. Fenby | 37 | Head | Laborer | Maryland |
| 49 | Catherine H. Fenby | 36 | Wife | Teacher | Maryland |
| 50 | Cornelia Fenby | 7 | Daughter | — | Maryland |
| 51 | Rose M. B. Gilpin | 70 | Head | — | Maryland |
| 52 | John D. Hiett | 64 | Head | Gardner | Indiana |
| 53 | Amy G. Hiett | 61 | Wife | — | Indiana |
| 54 | Jennie V. Berry | 79 | Aunt | — | Indiana |
| 55 | Stanley M. Burrow | 35 | Head | Salesman | Maryland |
| 56 | Pauline E. Burrow | 37 | Wife | — | Maryland |
| 57 | Thomas F. Opie | 56 | Head | Painter | Virginia |
| 58 | Mary P. Opie | 55 | Wife | — | Alabama |
| 59 | William J. Hoyle | 77 | Head | Operator | Maryland |
| 60 | Mattie E. G. Hoyle | 62 | Wife | — | Maryland |
| 61 | Robert P. Doper | 65 | Head | Operator | Maryland |
| 62 | Mary V. B. Doper | 65 | Wife | — | Maryland |
| 63 | — | None | — | — | — |
| 64 | Brooke F. Johns | 46 | Head | Operator | Dist of Col |
| 65 | Hazel M. Johns | 32 | Wife | — | Maryland |
| 66 | Brooke F. Jr. Johns | 15 | Son | — | Maryland |
| 67 | James S. Johns | 12 | Son | — | Maryland |
| 68 | John S. Johns THIS PERSON | 11 | Son | — | Maryland |
| 69 | Martha H. Johns | 10 | Daughter | — | Maryland |
| 70 | Joan B. Johns | 8 | Daughter | — | Maryland |
| 71 | Jocelyn S. Johns | 6 | Daughter | — | Maryland |
| 72 | Amelia Johns | 65 | Mother | — | Dist of Col |
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)