JD
John Day — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this John Day across the 1910, 1920 and 1930 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a head (b.~1899), then head of a 7-person household.
Age 31
b. ~1899
Male
Head
Born: Maryland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Day |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 21 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Occupation | Draughtsman |
| Industry | Steel Construct |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 40 |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Draughtsman |
| Township / Ward | Baltimore |
| Est. Birth Year | ~1899 |
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 |
|---|---|---|---|---|
| Viola Day | Daughter | — | 8 | ~1922 |
| Vivian Day | Daughter | — | 6 | ~1924 |
| Dorothy Day | Daughter | — | 10 | ~1920 |
| John Day | Head | — | 31 | ~1899 |
| Robert Day | Son | — | 2 | ~1928 |
| Donald Day | Son | — | ~1930 | |
| Gladys Day | Spouse | — | 28 | ~1902 |
Census Appearances
1910
Montgomery, Maryland
Other, age 10
Montgomery, Maryland · implied b. ~1900 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | John D |
| Relationship to Head | Nephew |
| Sex | M |
| Color / Race | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1920
Baltimore, Maryland
Other, age 21
Baltimore, Maryland · implied b. ~1899 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | John L. |
| Relationship to Head | Brother-in-law |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Pennsylvania |
| Occupation | Draftsman |
| Industry | Steel Co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Head, age 31
Baltimore, Maryland · implied b. ~1899 — 7 household members
| Surname | Day |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 21 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Draughtsman |
| Industry | Steel Construct |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 40 |
| 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 Day across 3 US Census years (1910, 1920 and 1930) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Day
Head · 1930 · age 31 · b. ~1899 · 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
50 people indexed on this census page (ia:1930:15thcensus854unit:0218)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Charles Klein | 28 | Head | Superintendent | Maine |
| 52 | Myrtle Klein | 24 | Wife | — | Maryland |
| 53 | Betty A Klein | 5 | Daughter | — | Maryland |
| 54 | Ethel Klein | 1 | Daughter | — | Maryland |
| 55 | Annie Klein | 58 | Mother | Retired | Missouri |
| 56 | Charles W Killmon | 45 | Head | Carpenter | Maryland |
| 57 | Georgia Killmon | 35 | Wife | — | West Virginia |
| 58 | Doris Killmon | 7 | Daughter | — | Maryland |
| 59 | Frank Howe | 35 | Head | Agent | Oklahoma |
| 60 | Ethel Howe | 32 | Wife | Saleslady | Maryland |
| 61 | Mary Rapp | 56 | Mother-in-law | Operator | Maryland |
| 62 | Emmet Norris | 40 | Head | Collector | Maryland |
| 63 | Anna Norris | 38 | Wife | — | Maryland |
| 64 | Virginia Mayhew | 21 | Daughter | — | Maryland |
| 65 | Florence Mayhew | 8 | Grandson | — | Maryland |
| 66 | Evelyn Mayhew | 6 | Granddaughter | — | Maryland |
| 67 | George Mayhew | 2 | Grandson | — | Maryland |
| 68 | Lloyd Halley | 24 | Boarder | Fireman | Pennsylvania |
| 69 | Russel Norris | 19 | Son | Assistant Manager | Maryland |
| 70 | Pearl Morrison | 20 | Boarder | Packer | Maryland |
| 71 | Vernon Dillman | 23 | Head | Electrician | Maryland |
| 72 | Eleanor Dillman | 21 | Wife | — | Maryland |
| 73 | George Dillman | 4 | Son | — | Maryland |
| 74 | Theresa Dillman | 2 | Daughter | — | Maryland |
| 75 | Elmer Fabel | 68 | Head | Gravedigger | Maryland |
| 76 | Johanna Fabel | 65 | Wife | — | Northern Ireland |
| 77 | John Fabel | 41 | Son | Street Cleaner | Maryland |
| 78 | Cecelia Sternfeld | 32 | Daughter | — | Maryland |
| 79 | Armand Sternfeld | 2 | Son-in-law | — | Maryland |
| 80 | John Egan | 42 | Uncle | Supply Clerk | Maryland |
| 81 | John Day THIS PERSON | 31 | Head | Draughtsman | Maryland |
| 82 | Gladys Day | 28 | Wife | — | Maryland |
| 83 | Dorothy Day | 10 | Daughter | — | Maryland |
| 84 | Viola Day | 8 | Daughter | — | Maryland |
| 85 | Vivian Day | 6 | Daughter | — | Maryland |
| 86 | Robert Day | 2 | Son | — | Maryland |
| 87 | Donald Day | 0 | Son | — | Maryland |
| 88 | Harriet Edwards | 71 | Head | — | Virginia |
| 89 | Richard Edwards | 52 | Son | Bookkeeper | Virginia |
| 90 | Harry Edwards | 32 | Son | Office Work | Virginia |
| 91 | Harry Schaumloeffel | 30 | Son-in-law | Stock Clerk | Maryland |
| 92 | Leila A Schaumloeffel | 29 | Daughter | — | Virginia |
| 93 | Harry Schaumloeffel | 5 | Grandson | — | Maryland |
| 94 | Milton Nicholson | 39 | Head | Salesman | Virginia |
| 95 | Lillian Nicholson | 36 | Wife | — | Maryland |
| 96 | Bryce Nicholson | 17 | Son | — | Maryland |
| 97 | Dorothy Nicholson | 15 | Daughter | — | Maryland |
| 98 | Harold Harold | 13 | Son | — | Maryland |
| 99 | Marjorie Harold | 11 | Daughter | — | Maryland |
| 100 | Ronald Harold | 8 | Son | — | 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)