John Koch — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Clark-County, Washington

Our Model Tree links this John Koch across the 1930 and 1940 US Censuses in Clark-County, Washington (XGBoost, ~Confirmed) — first a head (b.~1894), then head of a 6-person household.

Age 46 b. ~1894 Male Head Born: Massachusetts Married

1940 Census Record Details

Census Year	1940
Location	Clark-County, Washington
Surname	Koch
Given Name	John P
Relationship to Head	Head
Sex	M
Color / Race	White
Age	46
Marital Status	Married
Birthplace	Massachusetts
1935 Residence (City)	Vancouver city
1935 Residence (County)	Clark
Additional Details
Occupation	Locomotive Fireman
Industry	Railroads
Class of Worker	PW
Hours Worked	48
Income (1939)	1900
Highest Grade	H-4
1935 Residence	Same place
Birth State	Massachusetts
Birth Country	United States
Birthplace (normalized)	massachusetts
Occupation	Locomotive Fireman
Township / Ward	Vancouver City
Est. Birth Year	~1894

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
Edna Koch	Daughter	—	13	~1927
Magdalena Koch	Spouse	—	44	~1896
Eugene Koch	Son	—	11	~1929
Ernest Koch	Son	—	16	~1924
George Koch	Son	—	9	~1931
John Koch	Head	—	46	~1894

Census Appearances

1930

Clark, Washington

Head, age 36

Clark, Washington · implied b. ~1894 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Koch
Given Name	John P.
Relationship to Head	Head
Sex	M
Color / Race	White
Age	36
Marital Status	Married
Birthplace	Massachusetts
Age at First Marriage	27
Father's Birthplace	Canada French
Mother's Birthplace	France
Occupation	Fireman
Industry	S.P. & S. Railroad
Class of Worker	W
Can Read/Write	Yes
Home Owned/Rented	O
Home Value / Rent	4000
Radio Set	R
Veteran	Yes
Birth State	Massachusetts
Birth Country	United States
Birthplace (normalized)	massachusetts

1940

Clark-County, Washington

Head, age 46

Clark-County, Washington · implied b. ~1894 — 6 household members

Surname	Koch
Given Name	John P
Relationship to Head	Head
Sex	M
Color / Race	White
Age	46
Marital Status	Married
Birthplace	Massachusetts
1935 Residence (City)	Vancouver city
1935 Residence (County)	Clark
Occupation	Locomotive Fireman
Industry	Railroads
Class of Worker	PW
Hours Worked	48
Income (1939)	1900
Highest Grade	H-4
1935 Residence	Same place
Birth State	Massachusetts
Birth Country	United States
Birthplace (normalized)	massachusetts

Model Tree

Linked across censuses

Our Model Tree links John Koch across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

John Koch

Head · 1940 · age 46 · b. ~1894 · Washington

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Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — Clark-County, Washington Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-04335-00485)

Line	Name	Age	Relation	Occupation	Birthplace
41	Ruben Schram	6	son	—	Washington
42	Mildred Heatherson	25	daughter	Peeler	South Dakota
43	Marjorie Heatherson	9	grand-daughter	—	Washington
44	Evelyn Heatherson	8	grand-daughter	—	Washington
45	Richard Heatherson	7	grand-son	—	Washington
46	Ronald Heatherson	4	grand-son	—	Washington
47	Lizzie M Christenson	69	Head	—	New Jersey
48	Edward E Pratt	52	Head	Laborer	Pennsylvania
49	Nellie Pratt	57	wife	—	Michigan
50	Elsie Pratt	17	daughter	—	Pennsylvania
51	James Pratt	14	son	—	Pennsylvania
52	Mary Pratt	12	daughter	—	Pennsylvania
53	Kathleen Pratt	10	daughter	—	Pennsylvania
54	John P Koch THIS PERSON	46	Head	Locomotive Fireman	Massachusetts
55	Magdalena Koch	44	wife	—	Illinois
56	Ernest Koch	16	son	—	Washington
57	Edna Koch	13	daughter	—	Washington
58	Eugene Koch	11	son	—	Washington
59	George Koch	9	son	—	Washington
60	Leroy Alan	31	Head	Linotype Operator	Washington
61	Thelma Alan	29	wife	—	Washington
62	Ronald Alan	9	son	—	Washington
63	Darlene Alan	5	daughter	—	Washington
64	Albert A Morton	72	Head	—	Kansas
65	Alice Morton	63	wife	—	Wisconsin
66	Margaret Morton	26	daughter	Undertaker	Washington
67	Joseph A Hamel	27	Head	Lumber Grader	Vermont
68	Jennie M Hamel	25	wife	Stenographer	Washington
69	Harriet Clouston	84	Head	—	Scotland
70	John De Lotal	65	Head	—	Ohio
71	Margaret De Lotal	46	wife	—	Missouri
72	Melvin Anderson	28	Head	Marine Engineer	California
73	Margaret Anderson	34	wife	—	South Dakota
74	Donovan Graham	16	step-son	—	Minnesota
75	Stewart F Dittmar	26	Head	Recreation Leader	Illinois
76	Virginia M Dittmar	19	wife	Canning	Oregon
77	Marjorie Dittmar	2	daughter	—	Washington
78	George Collins	87	Head	—	Iowa
79	Ida L Collins	82	wife	—	New York
80	Ira E	63	son	Painter	Wisconsin

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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)

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