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John Koch — 1930 US Census Record
Model Tree available1930 United States Federal Census · Lehigh, Pennsylvania
Our Model Tree links this John Koch across the 1920, 1930 and 1940 US Censuses in Lehigh, Pennsylvania (XGBoost, ~Confirmed), with identified parents James & Flossie — first a son (b.~1909), then head of a 3-person household.
Age 21
b. ~1909
Male
Son
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Lehigh, Pennsylvania |
| Surname | Koch |
| Given Name | John W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Occupation | Bookkeeper |
| Industry | Oil Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Bookkeeper |
| Township / Ward | Allentown City |
| Est. Birth Year | ~1909 |
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.
3 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Koch | Son | — | 21 | ~1909 |
| Paul Koch | Son | — | 22 | ~1908 |
| Robert Koch | Head | — | 45 | ~1885 |
Census Appearances
1920
Lehigh, Pennsylvania
Son, age 11
Lehigh, Pennsylvania · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koch |
| Given Name | John W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Lehigh, Pennsylvania
Son, age 21
Lehigh, Pennsylvania · implied b. ~1909 — 3 household members
| Surname | Koch |
| Given Name | John W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Bookkeeper |
| Industry | Oil Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Lehigh-County, Pennsylvania
Head, age 29
Lehigh-County, Pennsylvania · implied b. ~1911 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kech |
| Given Name | John W. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Allentown City |
| 1935 Residence (County) | Lehigh |
| Occupation | Bookkeeper |
| Industry | Oil corporation |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 210 |
| Highest Grade | H-4 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Koch across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Koch (~0.92 confidence) and mother Flossie Koch (~0.92 confidence) and father Robert Koch (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Koch
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Flossie Koch
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
Robert Koch
b. ~1885
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Koch
Son · 1930 · age 21 · b. ~1909 · Pennsylvania
★ You are viewing this record
Sibling
Paul Koch
Sibling · 1930 · age 22
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
1930 US Federal Census — Lehigh, Pennsylvania
Open full size
1930 US Federal Census — Lehigh, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2063:0432)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Katie C. Hess | 71 | Wife-H | — | Pennsylvania |
| 52 | William Reffert | 65 | Head | — | Pennsylvania |
| 53 | Sallie Reffert | 63 | Wife-H | — | Pennsylvania |
| 54 | Martin T. Oplinger | 27 | Head | Salesman | Pennsylvania |
| 55 | Leoda Oplinger | 20 | Wife-H | — | Pennsylvania |
| 56 | Richard L. Oplinger | 0 | Son | — | Pennsylvania |
| 57 | Roy R. Oplinger | 26 | Brother | Chauffeur | Pennsylvania |
| 58 | Lizzie A. P. Oplinger | 57 | Mother | — | Pennsylvania |
| 59 | Robert L. Koch | 45 | Head | Salesman | Pennsylvania |
| 60 | Paul F. Koch | 22 | Son | Bookkeeper | Pennsylvania |
| 61 | John W. Koch THIS PERSON | 21 | Son | Bookkeeper | Pennsylvania |
| 62 | Charles A. Albright | 36 | Head | Shipping Clerk | Pennsylvania |
| 63 | Eloise L. Albright | 28 | Wife-H | — | Delaware |
| 64 | Emerson M. Albright | 13 | Son | — | Pennsylvania |
| 65 | Malcolm W. Albright | 11 | Son | — | Pennsylvania |
| 66 | Marion E. Albright | 9 | Daughter | — | Pennsylvania |
| 67 | Charles A. Jr. Albright | 4 | Son | — | Pennsylvania |
| 68 | Dorothy M. Albright | 1 | Daughter | — | Pennsylvania |
| 69 | Eli P. Clauer | 52 | Head | Clerk | Pennsylvania |
| 70 | Myra K. Clauer | 52 | Wife-H | — | Pennsylvania |
| 71 | Harvey J. Mummey | 53 | Head | Weaver | Pennsylvania |
| 72 | Amy E. Mummey | 53 | Wife-H | — | Pennsylvania |
| 73 | Alice B. Lightcap | 59 | Head | — | Pennsylvania |
| 74 | Harry Boyle | 35 | Son-in-law | Repairman | Delaware |
| 75 | Bernice J. Boyle | 27 | Daughter | — | Pennsylvania |
| 76 | John J. Boyle | 4 | Grandson | — | Pennsylvania |
| 77 | James J. Biery | 51 | Head | Electrician | Pennsylvania |
| 78 | Ella L. Biery | 56 | Wife-H | — | Pennsylvania |
| 79 | James S. Jr. Biery | 3 | Son | — | Pennsylvania |
| 80 | Marilyn L. Biery | 1 | Daughter | — | Pennsylvania |
| 81 | Willis E. Fasnacht | 28 | Head | Salesman | Pennsylvania |
| 82 | Miriam L. Fasnacht | 25 | Wife-H | — | Pennsylvania |
| 83 | William Best | 59 | Head | — | Pennsylvania |
| 84 | Lillie L. Best | 58 | Wife-H | — | Pennsylvania |
| 85 | Lewis D. Clauer | 52 | Head | — | Pennsylvania |
| 86 | Jane A. Clauer | 52 | Wife-H | — | Pennsylvania |
| 87 | Harold J. Marks | 42 | Son-in-law | Professor | Pennsylvania |
| 88 | Edna L. Marks | 42 | Daughter | — | Pennsylvania |
| 89 | Ruth L. Peters | 30 | Niece | Bookkeeper | Pennsylvania |
| 90 | Francis H. Jacoby | 53 | Head | Salesman | Pennsylvania |
| 91 | Daisy A. Jacoby | 49 | Wife-H | — | Pennsylvania |
| 92 | Robert W. Fluck | 44 | Head | Engineer | Pennsylvania |
| 93 | Florence M. Fluck | 44 | Wife-H | — | Pennsylvania |
| 94 | Edward S. Fluck | 20 | Son | — | Pennsylvania |
| 95 | Alma M. Fluck | 13 | Daughter | — | Pennsylvania |
| 96 | Claude Yost | 50 | Head | Dealer | Pennsylvania |
| 97 | Grace C. Yost | 46 | Wife-H | — | Pennsylvania |
| 98 | Elmer J. Clough | 51 | Head | Salesman | Pennsylvania |
| 99 | Emma J. Clough | 53 | Wife-H | — | Pennsylvania |
| 100 | Paul R. Clough | 15 | Son | Clerk | Pennsylvania |
Pedigree Summary
John + 1 sibling
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)