1a.  England & Wales FreeBMD Marriage Index: 1837-1915 (online at Ancestry.com):

MARRIAGES registered in October, November, and December, 1875
p.		District	Vol	Page
74	Davies, David	Bridgend	11a	807
74	Davies, Elizabeth	Bridgend	11a	807

1b.  Wales, Glamorgan, Parish Register, Marriages, 1837-1922 (online at familysearch.org):

Name	David Davies
Event	Marriage
Event Date	2 Oct 1875
Event Place	Llangynwyd, Glamorgan, Wales
Gender	Male
Marital Status	Single
Father	William Davies
Spouse	Elizabeth Davies
Spouse's Marital Status	Single
Spouse's Father	Thomas Davies
Digital Folder	004173995

2.  1861 Census of England and Wales Every-Name-Index/Images (online at Ancestry.com):  David DAVIES (æ 6, b. Llangynwyd, GLA) is living in Maesteg, Llangynwyd, GLA, with his parents (q.v.).

3.  1871 Census of England and Wales Every-Name-Index/Images (online at Ancestry.com):  can't find.

4.  1881 Census of England and Wales Every-Name-Index/Images (online at Ancestry.com, Image #40 of 81):  official enumeration date 3 Apr 1881 (extracted by Diana Gale Matthiesen):

Class	GSU Roll	Reg. Dist.	Reg. Sub-dist.	County	ED	Piece	Folio	Pg
RG11	1342283	Bridgend	Maesteg	Glamorgan	16	5328	83	39

Civil Parish [or Township] of	City or Municipal Borough of	Municipal Ward of	Paliamentary Borough of	Town or Village or Hamlet of	Urban Sanitary District of	Rural Sanitary District of	Eclesiastical Parish or District of
Llangeinor				Ogmore Valley		Bridgend & Cowbridge Union	Llangeinor

1881:  for an explanation of the column headings, please see What the Numbers in the British Censuses Mean.

1

2

3a

3b

4

5

6

7a

7b

8

9

10

170

3 High St

/

David Davies

Head

Mar

25

Coal Miner

Glamorganshire

Llangynwyd

Elizabeth do

Wife

Mar

24

Do

Do

Margaret Do

Dau

4

Do

Neath

Williams Walters

Boarder

Mar

25

Coal Miner

Pembrookshire

St Davies

5.  1891 Census of England and Wales Every-Name-Index/Images(online at Ancestry.com, Image #37 of 48):  official enumeration date 5 Apr 1891 (extracted by Diana Gale Matthiesen):

Class	GSU Roll	Reg. Dist.	Reg. Sub-dist.	County	ED	Piece	Folio	Pg
RG12		Bridgend	Maesteg	Glamorgan	2	4449	46	36

Administrative County of	Civil Parish of	Municipal Borough of	Municipal Ward of	Urban Sanitary District of	Town or Village or Hamlet of	Rural Sanitary District of	Parliamentary Borough or Division of	Eclesiastical Parish or District of
Glamorgan	Higher Llangywyd			Maesteg	Maesteg		Midglamorgan	Llangywyd

1891:  for an explanation of the column headings, please see What the Numbers in the British Census Mean (missing columns contained no data).

1

2

3

5

6

7

8

9

10

11

13

15

17

200

23 Grove St

/

4

David Davies

Head

M

36

Coal Miner

X

Glamorgan

Maesteg

Welsh

Elizabeth do

Wife

M

35

do

do

Welsh

Margaret  do

Daur

S

14

do

do

Welsh

David T   do

Son

S

8

Scholar

do

do

Welsh

William E do

Son

S

6

do

do

do

Welsh

Egrin R   do

Son

S

2

do

do

Welsh

Emrys     do

Son

S

3mo

do

do

Welsh

William   do

Relative

Widr

66

Coal Miner

X

do

St Brides

Welsh

"Scholar" means student.  The older William is David's father.

6.  1901 Census of England and Wales: Every-Name-Index/Images (online at Ancestry.com, Image #57 of 87):  official enumeration date 31 Mar 1901 (extracted by Diana Gale Matthiesen):

Class	GSU Roll	Reg. Dist.	Reg. Sub-dist.	Admin. County	ED	Piece	Folio	Pg
RG13		Bridgend	Ogmore	Glamorgan	5	5044	32	56

Civil Parish of	Ecclesiastical Parish of	County Borough, Municipal Borough, or Urban District of	Ward of Municipal Borough or of Urban District of	Rural District of	Parliamentary Borough or Division of	Town or Village or Hamlet of
Llangeinor	Garw Valley		Garw		Mid Glamorgan

1901:  for an explanation of the column headings, please see What the Numbers in the British Census Mean (missing columns contained no data).

1

2

3

8

9

10

11

12

13

14

16

18

303

32 Meadow St

/

Dd Davies

Head

M

45

Coal Miner [CHewer]

Worker

Glam

Maesteg

Both

Elizabeth Do

Wife

M

44

Do

Do

Do

Margaret Styles

Daur

S

24

Do

Do

Do

Jno        Do

S in Law

S

26

Master Haulier B.G. [CBelow]

Do

Do

Coytrehen

Do

Dd T Davies

Son

S

18

Do

Maesteg

Do

Wm E    Do

Son

S

16

Do

Do

Do

Egren R Do

Son

S

13

Do

Pontycymer

Do

Emrys   Do

Son

S

10

Do

Maesteg

Do

In the same almost unreadable handwriting, but a different pen, the enumerator came back and wrote over and/or above the orginal occupation; both are hard to read.  I've shown the added occupations [in brackets].  "B.G." stands for "below ground."  "CBelow" is in contrast to "CAbove" and "CHewer," with the "C" standing for "coal."  For definitions of these occupations, see:  hewer and haulier.

7.  1911 Census of England and Wales Every-Name-Index/Images (online at Ancestry.com, Image #146 of 691): official enumeration date 2 Apr 1911 (extracted by Diana Gale Matthiesen):

Class	Reg. Dist.	Reg. Sub-dist. | No.	County	Civil Parish	ED	Piece	Sched. No.
RG14	Bridgend	Maesteg | 591	Glamorgan	Cwmdu	07	32532	73

1911:  for an explanation of the column headings, please see What the Numbers in the British Census Mean.
	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
1	Dd Davies	Head	57		M					Coal Miner Hewer		worker	home	Glam Maesteg	Welsh		Welsh
2	Elizabeth Davies	Wife		56	M	36	6	4	2					Glam Nantyffyllon	Welsh		Both
3	William Ed Davies	Son	27		S					Coal Miner hewer		worker		Glam Nantyffyllon	Welsh		Both
4	Emris Davies	Son	21		S					Coal Miner hewer		worker		Glam Nantyffyllon	Welsh		Both
5	Elizabeth Thomas	Servant		21	S					General Servant Domestic		worker		Glam Nantyffyllon	Welsh		Both
Number of Rooms:  4  Informant's Signatue:  David Davies 103 3 Riverside Cottages  Informant's Postal Address:  Nantyffyllon Glamorganshire, South Wales

In 1911, only, we are shown images of the original forms filled out by the householders, rather than transcriptions.

8.  1921 Census of Wales: Every-Name-Index/Images (online at Ancestry.com):  the 1921 census will be released in 2022.

9.  England & Wales, National Probate Calendar (Index of Wills and Administrations), 1858-1966 (online at Ancestry.com):

1925 p. 27	DAVIES David of 102 Riverside-cottages Maesteg Glamorganshire died 23 February 1925 Probate London 31 December to Elizabeth Davies widow.  Effects £275.
1927 p. 31	DAVIES Elizabeth of 102 Riverside-cottages Nantyffyllon Maesteg Glamorganshire widow died 20 September 1926 Administration (with Will) London 24 January to Egrin Davies colliery drifter.  Effects £50.
1938 p. 39	DAVIES Egryn Rhys of 102 High-street Nantyffyllon Glamorganshire died 2 November 1927 Administration Llandaff 2 April to Emrys Davies railway platelayer. Effect £10.
The value of the English pound in 1925 was US$4.87, so £275 = $1339.25.  The spending power of the US dollar in 1925, compared to 2016, was $13.67, so $1339.25 = $18,310.18.

10.  Public Member Trees (online at Ancestry.com).

11.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).