JF
John Frederick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this John Frederick across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 6-person household.
Age 12
b. ~1928
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Frederick |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Thomas Frederick | Son | — | 5 | ~1935 |
| John Frederick | Son | — | 12 | ~1928 |
| John Frederick | Head | — | 40 | ~1900 |
| Frances Frederick | Spouse | — | 36 | ~1904 |
| Charles Frederick | Son | — | 8 | ~1932 |
| Joseph Frederick | Son | — | 10 | ~1930 |
Census Appearances
1930
Baltimore, Maryland
Son, age 1
Baltimore, Maryland · implied b. ~1929 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Son, age 12
Baltimore-City-County, Maryland · implied b. ~1928 — 6 household members
| Surname | Frederick |
| Given Name | John S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| 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 John Frederick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Frederick
Son · 1940 · age 12 · b. ~1928 · Maryland
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Sibling
Joseph Frederick
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Frederick
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Frederick
Sibling · 1940 · age 5
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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01528-00605)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Richard Hutchins | 19 | Son | Apprentice | Maryland |
| 42 | William S. Hamill | 31 | Head | Statistician | Ohio |
| 43 | Alton S. Schleuder | 34 | Head | Repairman | Maryland |
| 44 | Pauline Schleuder | 36 | Wife | — | Pennsylvania |
| 45 | Alton Jr. Schleuder | 3 | Son | — | Maryland |
| 46 | Ida M. Vatner | 70 | Head | — | Maryland |
| 47 | Charles A. Hutchins | 66 | Head | — | Maryland |
| 48 | Minnie G. Hutchins | 63 | Wife | — | Maryland |
| 49 | Edward W. Nehling | 65 | Head | — | Maryland |
| 50 | Rose S. Nehling | 67 | Wife | Cost Clerk | Virginia |
| 51 | Edward A. Nehling | 34 | Son | — | Maryland |
| 52 | Ronald S. Nehling | 7 | Grandson | — | Maryland |
| 53 | Michael J. Cooney | 53 | Head | Mechanic | Maryland |
| 54 | Dorothea Cooney | 49 | Wife | Policewoman | Maryland |
| 55 | Gloria J. Cooney | 25 | Daughter | — | Maryland |
| 56 | John S. Rutherford | 36 | Head | Secretary | Maryland |
| 57 | Mary F. Rutherford | 26 | Wife | Clerk | Maryland |
| 58 | Theresa C. Cross | 70 | Mother-in-law | Saleslady | Maryland |
| 59 | Frank Buckingham | 48 | Head | — | Maryland |
| 60 | Olive X. Buckingham | 43 | Wife | Salesman | Maryland |
| 61 | John M. Frederick | 40 | Head | — | Maryland |
| 62 | Frances E. Frederick | 36 | Wife | Plumber | Maryland |
| 63 | John S. Frederick THIS PERSON | 12 | Son | — | Maryland |
| 64 | Joseph Frederick | 10 | Son | — | Maryland |
| 65 | Charles Frederick | 8 | Son | — | Maryland |
| 66 | Thomas Frederick | 5 | Son | — | Maryland |
| 67 | Hamilton R. Atkinson | 49 | Head | Inspector | Maryland |
| 68 | Mildred A. Atkinson | 40 | Wife | — | Maryland |
| 69 | Lillian M. Atkinson | 18 | Daughter | — | Maryland |
| 70 | Jean L. Atkinson | 16 | Daughter | — | Maryland |
| 71 | John C. Atkinson | 11 | Son | — | Maryland |
| 72 | Wm. F. Melzer | 45 | Head | Ticket Agent | Maryland |
| 73 | Florence Melzer | 44 | Wife | — | Maryland |
| 74 | William T. Jr. Melzer | 14 | Son | — | Maryland |
| 75 | Russell Knipp | 66 | Head | — | Virginia |
| 76 | Elizabeth Knipp | 24 | Daughter | Teacher | Maryland |
| 77 | Elizabeth Foster | 22 | Niece | Secretary | Virginia |
| 78 | Grace G. Smith | 49 | Friend | — | Rhode Island |
| 79 | Harry E. Heiner | 64 | Head | Boilermaker | Maryland |
| 80 | Heiner | 62 | Wife | — | Maryland |
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)