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John Shaffer — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this John Shaffer across the 1920, 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a head (b.~1892), then head of a 5-person household.
Age 38
b. ~1892
Male
Head
Born: Maryland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Shaffer |
| Given Name | John L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 24 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Veteran | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Farmer |
| Township / Ward | Election Dist 14 |
| Est. Birth Year | ~1892 |
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.
5 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Clara Shaffer | Other | — | 31 | ~1899 |
| John Shaffer | Son | — | 12 | ~1918 |
| William Shaffer | Son | — | 8 | ~1922 |
| John Shaffer | Head | — | 38 | ~1892 |
| Elizabeth Shaffer | Daughter | — | 11 | ~1919 |
Census Appearances
1920
Baltimore, Maryland
Head, age 28
Baltimore, Maryland · implied b. ~1892 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Shaffer |
| Given Name | John H |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Clerk |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Head, age 38
Baltimore, Maryland · implied b. ~1892 — 5 household members
| Surname | Shaffer |
| Given Name | John L |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 24 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Veteran | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-County, Maryland
Head, age 48
Baltimore-County, Maryland · implied b. ~1892 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Schafer |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | 15th District |
| 1935 Residence (County) | Baltimore |
| Occupation | Farmer |
| Industry | Own Farm |
| Class of Worker | OA |
| Hours Worked | 98 |
| Income (1939) | 0 |
| Highest Grade | G-8 |
| 1935 Residence | Same House |
| 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 Shaffer across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Shaffer
Head · 1930 · age 38 · b. ~1892 · 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:1930:15thcensus846unit:0560)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Chelest A Vincity | 13 | Daughter | — | Maryland |
| 52 | William G Jr Vincity | 11 | Son | — | Maryland |
| 53 | Mae E Vincity | 8 | Daughter | — | Maryland |
| 54 | Harrison Ferguson | 35 | Head | Carpenter | Maryland |
| 55 | Hazel A Ferguson | 30 | Wife-H | — | Maryland |
| 56 | Virginia R Ferguson | 9 | Daughter | — | Maryland |
| 57 | Donald S Ferguson | 5 | Son | — | Maryland |
| 58 | Elizabeth Ferguson | 67 | Mother | — | Maryland |
| 59 | Sylvester Hammelburg | 29 | Head | Officer | Maryland |
| 60 | Gladys Hammelburg | 28 | Wife-H | — | Maryland |
| 61 | Lois G Hammelburg | 8 | Daughter | — | Maryland |
| 62 | William F Hammelburg | 3 | Son | — | Maryland |
| 63 | John A Heintz | 40 | Head | Carpenter | Maryland |
| 64 | Anna M Heintz | 41 | Wife-H | — | Maryland |
| 65 | Anna M Calvert | 32 | Boarder | Bookkeeper | Maryland |
| 66 | Irene R Calvert | 30 | Boarder | Asst. Buyer | Maryland |
| 67 | Otis G Smith | 30 | Head | Proprietor | Maryland |
| 68 | Nellie J Smith | 31 | Wife-H | — | Maryland |
| 69 | Joseph T Reeper | 34 | Head | Carpenter | Maryland |
| 70 | Frances J Reeper | 37 | Wife-H | — | Austria |
| 71 | Joseph F Reeper | 11 | Son | — | Maryland |
| 72 | Charles E Bush | 30 | Head | Collector | Maryland |
| 73 | Emma I Bush | 27 | Wife-H | — | Maryland |
| 74 | Charles Bush | 8 | Son | — | Maryland |
| 75 | George Bush | 5 | Son | — | Maryland |
| 76 | Emily M Bush | 2 | Daughter | — | Maryland |
| 77 | Howard B Helmer | 31 | Head | Fireman | Maryland |
| 78 | Anna I Helmer | 31 | Wife-H | — | Maryland |
| 79 | Gordon F Helmer | 13 | Son | — | Maryland |
| 80 | Helen M Helmer | 11 | Daughter | — | Maryland |
| 81 | Esther Helmer | 7 | Daughter | — | Maryland |
| 82 | Thomas J Hol | 61 | Head | Custodian | Maryland |
| 83 | Agatha M Hol | 63 | Wife-H | — | Germany |
| 84 | Sylvia M Hol | 23 | Daughter | Hostess | Maryland |
| 85 | Louise Means | 20 | Boarder | Teacher | North Carolina |
| 86 | Thomas J Mischke | 27 | Head | Proprietor | Maryland |
| 87 | Mary A Mischke | 30 | Wife-H | — | Maryland |
| 88 | Mildred S Mischke | 10 | Daughter | — | Maryland |
| 89 | Thomas W Jr Mischke | 2 | Son | — | Maryland |
| 90 | William Green | 39 | Head | Carpenter | Maryland |
| 91 | Lucille M Green | 34 | Wife-H | — | Maryland |
| 92 | Milton M Green | 11 | Son | — | Maryland |
| 93 | Doris L Green | 9 | Daughter | — | Maryland |
| 94 | Genevieve C Green | 7 | Daughter | — | Maryland |
| 95 | William J Green | 4 | Son | — | Maryland |
| 96 | John L Shaffer THIS PERSON | 38 | Head | Farmer | Maryland |
| 97 | Clara M Shaffer | 31 | Wife-H | — | Maryland |
| 98 | John P Shaffer | 12 | Son | — | Maryland |
| 99 | Elizabeth Shaffer | 11 | Daughter | — | Maryland |
| 100 | William M Shaffer | 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)