JF
John Frederick — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this John Frederick across the 1920 and 1930 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 7-person household.
Age 50
b. ~1880
Male
Head
Born: Maryland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Frederick |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 26 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Occupation | Brakeman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 4,500 |
| Radio Set | R |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Brakeman |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1880 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Frederick | Head | — | 50 | ~1880 |
| Ruth Frederick | Daughter | — | 21 | ~1909 |
| Pearl Frederick | Spouse | — | 40 | ~1890 |
| Naomi Frederick | Daughter | — | 16 | ~1914 |
| Altila Frederick | Daughter | — | 14 | ~1916 |
| Thomas Airey | Other | — | 75 | ~1855 |
| John Frederick | Son | — | 22 | ~1908 |
Census Appearances
1920
Baltimore, Maryland
Head, age 42
Baltimore, Maryland · implied b. ~1878 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Salesman |
| Industry | Auto Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Head, age 50
Baltimore, Maryland · implied b. ~1880 — 7 household members
| Surname | Frederick |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 26 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Brakeman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 4,500 |
| Radio Set | R |
| 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 (1920 and 1930) in Baltimore, Maryland, using XGBoost record linkage.
Show:
This person
Anchor record
John Frederick
Head · 1930 · age 50 · b. ~1880 · Maryland
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Baltimore, Maryland
Open full size
1930 US Federal Census — Baltimore, Maryland
Page Contents
25 people indexed on this census page (ia:1930:15thcensus869unit:0047)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William H. Roth | 56 | Head | Cabinet Maker | Maryland |
| 2 | Minnie E. Roth | 54 | Wife | — | District of Columbia |
| 3 | William H. Jr. Roth | 25 | Son | Floorers | Maryland |
| 4 | Eva M. Hanple | 30 | Daughter | Saleswoman | Maryland |
| 5 | Richard H. Williams | 39 | Head | Accountant | Maryland |
| 6 | Katherine E. Williams | 35 | Wife | — | Maryland |
| 7 | Richard H. Jr. Williams | 6 | Son | — | Maryland |
| 8 | Walter S. Ehmling | 41 | Brother-in-law | Electric Inspector | Maryland |
| 9 | Albert L. Ehmling | 38 | Brother-in-law | Policeman | Maryland |
| 10 | John W. Frederick THIS PERSON | 50 | Head | Brakeman | Maryland |
| 11 | Pearl S. Frederick | 40 | Wife | — | Maryland |
| 12 | John M. Frederick | 22 | Son | Wire Chief | Maryland |
| 13 | Ruth M. Frederick | 21 | Daughter | Stenographer | Maryland |
| 14 | Naomi E. Frederick | 16 | Daughter | — | Maryland |
| 15 | Altila H. Frederick | 14 | Daughter | — | Maryland |
| 16 | Thomas Airey | 75 | Uncle | — | Maryland |
| 17 | Phillip Rosendale | 58 | Head | Cabinet Maker | Maryland |
| 18 | Belle S. Rosendale | 54 | Wife | — | Maryland |
| 19 | Hannah J. Baxter | 77 | Mother-in-law | — | Maryland |
| 20 | James R. Baxter | 52 | Brother-in-law | Painter | Maryland |
| 21 | Arthur Powell | 30 | Nephew | Route Boss | Virginia |
| 22 | Viola B. Powell | 30 | Niece | Milliner | Maryland |
| 23 | John E. Russell | 39 | Head | Contractor | Maryland |
| 24 | May Russell | 42 | Wife | — | Maryland |
| 25 | Mildred Russell | 18 | Daughter | — | Maryland |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)