IGI coverage dates can only be considered a guide and may have errors and gaps. The LDS organised the records in the IGI into 'batches'. These batches relate to how and when the information was extracted from source material. The dates below are taken from the detail page of the first entry in the 'batch'. The batches referenced are from actual parish register extracts rather than personal submissions by LDS members. Much of the information was taken from the excellent website by Hugh Wallis:
http://freepages.genealogy.rootsweb.com/~hughwallis/IGIBatchNumbers.htm

The following parishes records have been searched without finding any STERRYS or similar:

Abergavenny RC (Baptisms 1653-1838-IGI)
Abergavenny Castle Street Independent (Baptisms 1711-1781, 1793-1837-IGI)
Abergavenny Frogmore Street Baptist (Baptisms 1773-1788, 1798-1837-IGI)
Abergavenny Wesleyan (Baptisms 1811-1837-IGI)
Abersychan English Baptist (Baptisms 1823-1837-IGI)
Aberystruth (Baptisms 1696-1815-BTs-Transcription of Monmouthshire Records by Mike John; Baptisms 1793-1836-Basptism Journal-Transcription of Monmouthshire Records by Mike John; Marriages 1696-1815-Transcription of Monmouthshire Records by Mike John; Burials 1696-1815-Transcription of Monmouthshire Records by Mike John)
Babell in Ynys Ddu (Welsh Calvinistic Methodist) (Baptisms 1828-1837-IGI)
Bassaleg (Baptisms 1725-1801-BTs; 1742-1762, 1768-1900-PR-Transcription of Monmouthshire Records by Mike John; Marriages 1743-1812-Transcription of Monmouthshire Records by Mike John)
Bassaleg (Bethel Baptist) (Baptisms 1812-1837-IGI)
Bedwas (Baptisms 1653-1715, 1717-1875-IGI)
Bedwellty (Baptisms 1696-1875-IGI)
Bedwellty Rock Welsh Calvinistic Methodist (Baptisms 1826-1836-IGI)
Bettws By Newport (Baptisms 1813-1873-IGI; Marriages 1816-1836-IGI)
Bettws Newydd (Baptisms 1813-1876-IGI; Marriages 1813-1836-IGI)
Bishton (Baptisms 1696-1823, 1826-1875-IGI; Marriages 1696-1854-IGI)
Blaenavon Welsh Calvinistic Methodist (Baptisms 1813-1837-IGI)
Bryngwyn (Baptisms 1696-1875-IGI; Marriages 1725-1838-IGI)
Caerleon Independent (Baptisms 1827-1835-IGI)
Caerwent (Baptisms 1659-1713, 1725-1875-IGI; Marriages 1813-1834-PR-Transcription of Monmouthshire Records by Mike John)
Caerwent Baptist (Baptisms 1815-1834-IGI)
Caldicot (Baptisms 1813-1874-IGI; Baptisms 1716-1800-PR-Transcription of Monmouthshire Records by Mike John; Marriages 1813-1859-IGI)
Castleton Welsh Calvinistic Methodist (Baptisms 1819-1837-IGI)
Chapel Hill (Baptisms 1771-1920-Forest of Dean Family History; Baptisms 1726-1869-IGI; Marriages 1730-1863-IGI; Marriages 1695-1812-Forest of Dean Family History; Burials 1695-1880-Forest of Dean Family History)
Chepstow (Baptisms 1725-1801-BTs-Transcription of Monmouthshire Records by Mike John; Baptisms 1725-1759, 1785-1916-Forest of Dean Family History; Marriages 1754-1837, 1901-1920-Forest of Dean Family History; Burials 1813-1924-Forest of Dean Family History)
Chepstow Beulah Independent (Baptisms 1828-1837-IGI; Baptisms 1865-1916-Forest of Dean Family History; Marriages 1865-1936-Forest of Dean Family History; Burials 1865-1958-Forest of Dean Family History)
Chepstow Wesleyan Methodist Circuit (Baptisms 1851-1899-Forest of Dean Family History)
Christchurch (Baptisms 1725-1875-IGI)
Coedkernew (Baptisms 1725-1873-IGI; Marriages 1725-1848-IGI)
Cwmavon Bethlehem Independent (Baptisms 1803-1837-IGI)
Cwmcarvan (Baptisms 1697-1875-IGI, Marriages 1813-1861-IGI)
Cwmyoy (Baptisms 1686-1875-IGI, Marriages 1686-1688, 1701-1845-IGI)
Devauden (Baptisms 1839-1873-IGI)
Dingestow (Baptisms 1725-1875-IGI; Baptisms 1696, 1725-1799-BTs-Transcription of Monmouthshire Records by Mike John; Marriages 1814-1837-IGI)
Dixton Newton (Baptisms 1660-1881-PR-Transcription of Monmouthshire Records by Mike John; Baptisms 1843-1875-IGI; Marriages 1873-1881-IGI; Marriages 1754-1812-Forest of Dean Family History)
Ebbw Vale And Crickhowell Wesleyan Circuit (Baptisms 1852-1875-IGI)
Gelli Groes Welsh Calvinistic Methodist (Baptisms 1814-1837-IGI)
Goldcliff (Baptisms 1725-1819, 1824-1875-IGI)
Goytre (Baptisms 1725-1865-IGI; Marriages 1725-1841-IGI)
Goytre Chapel Edd Welsh Calvinistic Methodist (Baptisms 1815-1833-IGI)
Grosmont (Baptisms 1589-1873-IGI; Marriages 1698-1699, 1725-1837-IGI)
Henllys (Baptisms 1726-1875-IGI, Marriages 1726-1858-IGI)
Itton (Baptisms 1725-1868-IGI)
Kemeys Commander (Baptisms 1820-1875-IGI)
Kemeys Inferior (Baptisms 1725-1875-IGI; Marriages 1725-1854-IGI)
Kendle Bethesda Welsh Calvinistic Methodist (Baptisms 1822-1837-IGI)
Kilgwrrwg (Baptisms 1814-1860-IGI; Marriages 1839-1842-IGI)
Llanarth (Baptisms 1725-1875-IGI )
Llanarth RC (Baptisms 1781-1835-IGI)
Llanbadoc (Baptisms 1582-1870-IGI)
Llandegveth (Marriages 1725-1832-IGI)
Llandenny (Baptisms 1725-1872-IGI, Marriages 1725-1851-IGI)
Llandevaud (Baptisms 1848-1875-IGI)
Llandogo (Baptisms 1725-1872-IGI; Baptisms 1694-1812-PR-Transcription of Monmouthshire Records by Mike John; Baptisms 1694-1901-Forest of Dean Family History; Marriages 1725-1871-IGI, Marriages 1813-1837-PR-Transcription of Monmouthshire Records by Mike John; Marriages 1698-1902-Forest of Dean Family History; Burials 1695-1887-Forest of Dean Family History)
Llanellen (Baptisms 1725-1870-IGI)
Llanfihangel Tor Y Mynydd (Baptisms 1813-1862-IGI)
Llanfoist (Baptisms 1725-1869-IGI; Marriages 1725-1816, 1821-1837-IGI)
Llanfrechfa (Baptisms 1816-1874-IGI)
Llangattock Juxta Caerleon (Baptisms 1725-1875-IGI, Marriages 1725-1837-IGI)
Llangattock Lingoed (Baptisms 1696-1875-IGI; Marriages 1800-1837-PR-Transcription of Monmouthshire Records by Mike John)
Llangattock Vibon Avel (Baptisms 1787-1812-PR-Transcription of Monmouthshire Records by Mike John; Baptisms 1813-1869-IGI; Baptisms 1696, 1725-1801-BTs-Transcription of Monmouthshire Records by Mike John; Marriages 1813-1869-IGI)
Llangeview (Baptisms 1758-1865-IGI)
Llangibby (Baptisms 1679-1868-IGI, Marriages 1725-1868-IGI)
Llangstone (Baptisms 1725-1875-IGI)
Llangwn (Baptisms 1663-1849-IGI)
Llanhennock (Baptisms 1813-1874-IGI, Marriages 1814-1853-IGI)
Llanhilleth (Baptisms 1725-1861-IGI)
Llanishem (Baptisms 1822-1875-IGI)
Llanishen (Baptisms 1725-1821-IGI, Marriages 1725-1853-IGI)
Llanllowel (Baptisms 1676-1867-IGI)
Llanmartin (Baptisms 1815-1875-IGI)
Llanmartin Welsh Calvinistic Methodist (Baptisms 1813-1835-IGI)
Llansantffraed (Marriages 1772-1866-IGI)
Llansoy (Baptisms 1592-1875-IGI, Marriages 1592-1647, 1664-1669, 1697-1753-IGI)
Llanthewy Rytherch (Baptisms 1670-1875-IGI, Marriages 1725-1837-IGI)
Llanthewy Skirrid (Baptisms 1813-1875-IGI)
Llanthewy Vach (Baptisms 1725-1875-IGI, Marriages 1725-1837, 1848-1852-IGI)
Llantilio Pertholey Forest Colpit Welsh Calvinistic Methodist (Baptisms 1814-1837-IGI)
Llantrissent (Baptisms 1725-1868-IGI, Marriages 1725-1852-IGI)
Llanvaches Tabernacle Independent (Baptisms 1799-1837-IGI)
Llanvair Discoed (Baptisms 1681-1796, 1803-1812-IGI)
Llanvapley Providence Chapel Non Conformist (Baptisms 1823-1833-IGI)
Llanvaply (Baptisms 1699-1724-IGI)
Llanvetherine (Baptisms 1740-1875-IGI)
Llanvihangel Llantarnam (Baptisms 1725-1740-IGI)
Llanvihangel Llantarnam Penwayne Independent (Baptisms 1817-1836-IGI)
Llanvihangel Rogiet (Baptisms 1815-1869-IGI)
Llanvihangel Ystern Llewern (Baptisms 1685-1881-IGI)
Llanwenarth (Baptisms 1813-1875-IGI, Marriages 1813-1837, 1864-1869-IGI)
Llanwenarth Calvanistic Methodist Church (Baptisms 1823-1825-IGI)
Llanwern (Marriages 1763-1812-IGI)
Magor (Baptisms 1725-1875 -IGI)
Malpas (Baptisms 1725-1854-IGI)
Mamhilad (Baptisms 1725-1861-IGI)
Mathern (Baptisms 1696, 1725-1815-BTs-Transcription of Monmouthshire Records by Mike John)
Michaelston Y Fedw (Baptisms 1781-1875-IGI, Baptisms 1660-1910-PR index, Marriages 1603-1837-PR index, Burials 1658-1967-PR index)
Mitchel Troy (Baptisms 1592-1717, 1819-1865-IGI; Baptisms 1725-1801-BTs-Transcription of Monmouthshire Records by Mike John; Marriages 1813-1842-PR-Transcription of Monmouthshire Records by Mike John )
Monkswood (Baptisms 1742-1807, 1813-1875-IGI)
Monmouth (Baptisms 1755-1766-PR-Transcription of Monmouthshire Records by Mike John; Baptisms 1843-1869-IGI)
Monmouth Mary Street Independent (Baptisms 1820-1837-IGI)
Monmouth Monmouth RC (Baptisms 1791-1830-IGI)
Monmouth Wesleyan (Baptisms 1808-1850-IGI)
Monmouth Bible Christian (Baptisms 1838-1916-Forest of Dean Family History)
Mounton (Baptisms 1813-1875-IGI)
Mynyddislwyn Beulah Baptist (Baptisms 1803-1837-IGI)
Mynyddyslwyn (Baptisms 1717-1842-IGI)
Nantyglo (Baptisms 1844-1863-IGI)
Nantyglo Hermon Particular Baptist (Baptisms 1812-1836-IGI)
Nantyglo Salem Welsh Calvinistic Methodist (Baptisms 1808-1837-IGI)
Nantyglo Iron Works English Wesleyan (Baptisms 1817-1837-IGI)
Nash (Baptisms 1725-1870-IGI)
Newchurch (Baptisms 1725-1868-IGI, Baptisms 1725-1800-BTs-Transcription of Monmouthshire Records by Mike John)
Newport Commercial Street English Baptist (Baptisms 1798-1814, 1825-1837-IGI)
Newport Hope Chapel Commercial Street Independent (Baptisms 1813-1837-IGI)
Newport Pillgwenlly (Baptisms 1864-1875-IGI)
Newport Saint Woolas (Baptisms 1725-1875-IGI)
Newport St. Pauls (Baptisms 1859-1868-IGI)
Newport The Tabernacle Independent or Congregational (Baptisms 1813-1837-IGI)
Newport Welsh Calvinistic Methodist (Baptisms 1813-1837-IGI)
Newport Wesleyan (Baptisms 1812-1837-IGI)
Newport Workhouse (Baptisms 1813-1875-IGI)
Oldcastle (Baptisms 1714-1838, 1847-1845-IGI)
Over Monnow Saint Thomas (Baptisms 1846-1867-IGI)
Panteg (Baptisms 1598-1854-IGI)
Panteg New Inn Or The Hall Congregational or Independent (Baptisms 1766-1837-IGI)
Pen Y Cae Ebbw Vale Iron Works English Wesleyan (Baptisms 1811-1837-IGI)
Pen Y Cae Penuel Welsh Calvinistic Methodist (Baptisms 1819-1837-IGI)
Penallt (Baptisms 1725-1900-Forest of Dean Family History; Baptisms 1725-1870-IGI; Marriages 1765-1840-PR-Transcription of Monmouthshire Records by Mike John; Marriages 1725-1930-Forest of Dean Family History; Burials 1725-1900-Forest of Dean Family History)
Penhow (Baptisms 1813-1875-IGI, Marriages 1813-1851-IGI)
Penmaen (Baptisms 1852-1872-IGI)
Penmaen Nebo Independent (Baptisms 1787-1833-IGI)
Penrhos (Baptisms 1560-1641, 1725-1875-IGI; Baptisms 1696, 1725-1800-BTs-Transcription of Monmouthshire Records by Mike John; Baptisms 1813-1900-PR-Transcription of Monmouthshire Records by Mike John)
Penyclawdd (Baptisms 1813-1875-IGI)
Penterry (Baptisms 1727-1799-BTs-Transcription of Monmouthshire Records by Mike John)
Perthyr RC (Baptisms 1711-1712-IGI)
Pontnewynydd (Baptisms 1857-1871-IGI)
Pontypool Welsh Calvinistic Methodist (Baptisms 1812-1837-IGI)
Portskewett (Baptisms 1725-1875-IGI, 1700-1812-PR-Transcription of Monmouthshire Records by Mike John; Marriages 1813-1837-PR-Transcription of Monmouthshire Records by Mike John)
Raglan (Baptisms 1725-1873-IGI)
Raglan Ebenezer Particular Baptist (Baptisms 1820-1837-IGI)
Redwick (Baptisms 1725-1879-IGI)
Rhymney (Baptisms 1843-1865-IGI)
Rhymney Iron Works Ebenezer Welsh Calvinistic Methodist (Baptisms 1815-1836-IGI)
Rhymney Iron Works Sion Independent (Baptisms 1821-1837-IGI)
Risca Zoar Welsh Calvinistic Methodist (Baptisms 1813-1837-IGI)
Rockfield (Baptisms 1725-1875-IGI; Baptisms 1696, 1725-1800-BTs-Transcription of Monmouthshire Records by Mike John)
Rogiett (Baptisms 1815-1867-IGI)
Rumney (Baptisms 1813-1865-IGI)
Rumney By Cardiff (Baptisms 1733-1812-IGI)
Saint Brides Netherwent (Baptisms 1725-1818-IGI)
Saint Mellons (Baptisms 1725-1869-IGI)
Saint Mellons Welsh Calvinistic Methodist (Baptisms 1812-1837-IGI)
St. Arvans (Baptisms 1829-1870-IGI, Baptisms 1725-1800-BTs-Transcription of Monmouthshire Records by Mike John); Baptisms 1726-1890-Forest of Dean Family History; Marriages 1837-1914-Forest of Dean Family History; Burials 1813-1912-Forest of Dean Family History)
St. Brides Netherwent (Baptisms 1819-1875-IGI)
St. Brides Wentlloog Providence Independent (Baptisms 1826-1837-IGI)
St. Maughans (Baptisms 1825-1872-IGI; 1725-1800-BTs-Transcription of Monmouthshire Records by Mike John)
St. Pierre (Baptisms 1697, 1725-1820-BTs-Transcription of Monmouthshire Records by Mike John; Marriages 1697, 1725-1820-BTs-Transcription of Monmouthshire Records by Mike John)
Skenfrith (Baptisms 1726-1800-BTs-Transcription of Monmouthshire Records by Mike John; Baptisms 1726-1765, 1813-1837-PR-Transcription of Monmouthshire Records by Mike John; Marriages 1813-1837-Transcription of Monmouthshire Records by Mike John)
Tintern Parva (Baptisms 1726-1800-BTs-Transcription of Monmouthshire Records by Mike John; Baptisms 1726-1916-Forest of Dean Family History; Marriages 1814-1837-PR-Transcription of Monmouthshire Records by Mike John; Marriages 1725-1926-Forest of Dean Family History)
Tredegar (Baptisms 1838-1861-IGI; Baptisms 1696, 1725-1800-BTs-Transcription of Monmouthshire Records by Mike John)
Tredegar Penuel Welsh Calvinistic Methodist (Baptisms 1806-1837-IGI)
Tredegar Iron Works English Wesleyan (Baptisms 1827-1837-IGI)
Tredegar Iron Works Sharon or Saron Independent (Baptisms 1821-1837-IGI)
Trelleck (Baptisms 1725-1875-IGI, Baptisms 1696, 1725-1800-BTs-Transcription of Monmouthshire Records by Mike John)
Trelleck Grange (Baptisms 1813-1873-IGI)
Trevethin (Baptisms 1725-1844-IGI)
Trevethin Babell or Siloh Independent (Baptisms 1836-1837-IGI)
Trevethin Ebenezer Independent (Baptisms 1766-1837-IGI)
Trosnant Welsh Particular Baptist (Baptisms 1804-1837-IGI)
Trostrey (Baptisms 1725-1875-IGI, Marriages 1725-1875-IGI)
Undy (Baptisms 1813-1875-IGI, Marriages 1697-1853-IGI)
Usk (Baptisms 1815-1875-IGI, Marriages 1815-1837-IGI)
Varteg Garn Ddyffeth Tabernacle Welsh Calvinistic Methodist (Baptisms 1827-1837-IGI)
Varteg Hill Wesleyan (Baptisms 1821-1837-IGI)
Welsh Bicknor (Baptisms 1771-1812-Forest of Dean Family History; Marriages 1756-1812, 1818-1851-Forest of Dean Family History; Burials 1771-1956-Forest of Dean Family History)
Welsh Bicknor Courtfield RC (Baptisms 1773-1790, 1805-1832-IGI)
Wentlooge Saint Bride (Baptisms 1813-1873-IGI, Marriages 1725-1836-IGI)
Whitson (Baptisms 1725-1875-IGI, Marriages 1725-1855-IGI)
Wilcrick (Baptisms 1725-1876 , Marriages 1725-1838-IGI)
Wolves Newton (Baptisms 1725-1862-IGI, Marriages 1725-1862-IGI)
Wolves Newton Nebo Independent (Baptisms 1817-1837-IGI)
Wonastow (Baptisms 1725-1861-IGI; Baptisms 1725-1801-BTs-Transcription of Monmouthshire Records by Mike John)

The following parishes have been searched and have located STERRYS or similar:

Llantillio Crossenny
Baptisms 1629-1871 (IGI); 1720-1864 (PR-Transcription of Monmouthshire Records by Mike John)
1826 Jun 18 John s. Jas and Elizabeth Sterry, otp, labr (IGI has son of John Sterry)

Llantillio Crossenny
Marriages 1754-1900 (PR-Transcription of Monmouthshire Records by Mike John)
+1861 Jan 24 Jas Sterry, Full Age, Bachelor, shoemaker, of this parish, Father: John Sterry, mason & Elizth Walbeoffe, Full Age, Spinster, of this parish, Lewis Walbeoffe, labr. Wit: Jas Walbeoffe, Mary Walbeoffe
1861 May 14 John Sterry, bachelor, full age, labr, Panty colin, Father: James Sterry, labr & Matha Philips, full age, spinster, Panty colin, Father: Jas Philips, labr Wit: Jas Bennett, Mary Anne Green?

Llantillio Crossenny
Burials 1762-1877 (PR-Transcription of Monmouthshire Records by Mike John)
1871 Aug 12 Elizth Sterry, otp, 89

Legend:
+ = Longhope, Gloucestershire, UK line