1.  Marriage Record:

2.  1890 Census:  the 1890 Census Population Schedules were destroyed.

3.  1900 Census Index/Images (online at Ancestry.com, Image #23 of 39):  624 Fremont Street, Lancaster City (Ward 8), Lancaster Co., PA, Roll T623_1424, p. 269A, SN 12, SD 8, ED 770, enumerated 7 Jun 1900, official enumeration date 1 Jun 1900 (extracted by Diana Gale Matthiesen):

1900:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

19

20

21

22

23

24

25

27

*

624

221

228

Koulp Harry C

Head

W

M

Sep 1858

41

M

17

PA

Ger

Ger

Teamster

0

Y

Y

Y

R

H

_____ Ka?te

Wife

W

F

Mar 1861

39

M

17

11

9

Ger

Ger

Ger

1881

19

Y

Y

Y

_____ Theordor

Son

W

M

Mar 1881

19

S

Ger

Ger

Ger

1881

19

Florist

1

Y

Y

Y

_____ Harry C

Son

W

M

Moy 1884

16

S

PA

PA

Ger

Carder Cotton

0

Y

Y

Y

_____ Kate F

Dau

W

F

Jul 1885

14

S

PA

PA

Ger

Spolling Cotton

0

Y

Y

Y

_____ John J

Son

W

M

Jan 1889

13

S

PA

PA

Ger

At School

8

Y

Y

Y

_____ Carle E

Son

W

M

Apl 1888

12

S

PA

PA

Ger

At School

10

Y

Y

Y

_____ Marggiett E

Dau

W

F

Feb 1890

10

S

PA

PA

Ger

At School

10

_____ George M

Son

W

M

Mar 1892

8

S

PA

PA

Ger

_____ Heallen C

Dau

W

F

Mar 1894

6

S

PA

PA

Ger

_____ Moriee F

Dau

W

F

Apr 1897

3

S

PA

PA

Ger

Koulp Mickel

Board

W

M

Mev 1863

36

S

PA

Ger

Ger

Labor

4

Y

Y

Y

*Fremont

Theodore was born before Harry & Kate were married and geography indicates she is Kate's son, rather than Harry's.  Michael is Harry's brother.  This enumerator was spelling-challenged.

4.  1910 Census Index/Images (online at Genealogy.com, Image #5 of 24):  620 Fremont Street, Lancaster City (Ward 8), Lancaster Co., PA, Roll T624_1354, p. 155A, SN 3A, SD 4, ED 89, enumerated 16 Apr 1910, official enumeration date 15 Apr 1910 (extracted by Diana Gale Matthiesen):

1910:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

17

18

19

20

21

22

23

24

25

26

27

28

*

620

46

46

Kolb Harry C Sr

Head

M

W

51

M1

26

Pennsylvania

(Ger) German

(Ger) German

Eng

Driver

Bottling Wagon

W

N

0

Y

Y

O

M

H

____ Catharine

Wife

F

W

49

M1

26

13

11

(Ger) German

(Ger) German

(Ger) German

1882

Eng

None

Y

Y

____ Theodore

Stepson

M

W

29

S

(Ger) German

(Ger) German

(Ger) German

1882

Eng

Driver

Bread Wagon

W

N

0

Y

Y

____ Harry C Jr

Son

M

W

25

S

Pennsylvania

Pennsylvania

(Ger) German

Eng

Laborer

Soap works

W

N

0

Y

Y

____ John

Son

M

W

23

S

Pennsylvania

Pennsylvania

(Ger) German

Eng

Lockmaker

Lock Works

W

N

0

Y

Y

____ Marguerite

Dau

F

W

20

S

Pennsylvania

Pennsylvania

(Ger) German

Eng

Finisher

Watch Factory

W

N

0

Y

Y

N

____ George

Son

M

W

18

S

Pennsylvania

Pennsylvania

(Ger) German

Eng

Moulder

Lock Works

W

N

0

Y

Y

N

____ Helen

Dau

F

W

16

S

Pennsylvania

Pennsylvania

(Ger) German

Eng

Bunchbreaker

Cigar Factory

W

N

0

Y

Y

N

____ Marie

Dau

F

W

13

S

Pennsylvania

Pennsylvania

(Ger) German

Eng

None

Y

Y

Y

____ Therese

Dau

F

W

9

S

Pennsylvania

Pennsylvania

(Ger) German

None

Y

____ Frances

Dau

F

W

3

S

Pennsylvania

Pennsylvania

(Ger) German

None

*Fremont Street

Theodore appears to be Catharine's child, not Harry's, but if she has been married only once, then Theodore was illegitimate and MÖLLER was Catharine's maiden name, not the name of a prior spouse.

5.  Participant in the CULP Y-chromosome DNA Surname Project at FamilyTreeDNA.