| Year | Settlers, Events, Business Starts |
| 1792 | James Glover, first settler arrived |
| 1794 | James Irvine, Teacher, built first log home |
| 1795 | Wm McCandless-Tailor; Wm McCandless-Distiller; Robert McCandless |
| 1796 | Adam Johnson, Sr.;Adam Johnson, Jr.; Joshua Stoolfire; George Stoolfire; Moses Meeker; Timothy Ward; David Spear |
| 1798 | Wm Crisswell; Wm Roseboro; James park; Mathew park; Silas Miller; Issac Covert; Joseph Means; Thomas Means |
| 1799 | John Richardson; William Forsythe; James Davidson, Sr.; james Davidson, Jr. |
| 1804 | First Church known as Covenanter |
| 1805 | First Log School in Adams Twp |
| 1807 | Rev Mathew Williams-Covenanter Church |
| 1813 | Thomas Kennedy; Andrew Barr |
| 1816 | Robert McKinney; Joe Staples |
| 1819 | R McKinney-Distillery |
| 1824 | Adam Johnson dies at age 103, settled here at age 75 |
| 1825 | Samuel Park-Grist Mill; Samuel Kennedy- Grist Mill; Log Church of Union Church Built |
| 1826 | Rev FC Guthrie-Covenenter Union Church |
| 1833 | Covenenter Church splits into Old and New Schools |
| 1836 | First Public School organized |
| 1838 | Union Church rebuilt with brick |
| 1844 | James Glover, first settler, dies |
| 1850 | D Roberts-Livery |
| 1854 | Adams Twp formed fromCranberry & Middlesex Twps.; First Election held in home of J Douthett |
| 1857 | Dr Wm Irvine-First physician |
| 1860 | Adams population 866 |
| 1862 | F Johnson-General Store |
| 1870 | JA & WT Anderson-Bricks |
| 1871 | R Conley-Blacksmith |
| 1873 | Post Office opens in home of Sam Parks; Mars marks beginning as town |
| 1874 | R McCandless-Contractor |
| 1876 | Globe Roller Mill; Property donated for Reformed Presbyterian Church; Mt Olive Evangelical Church |
| 1877 | Reformed Church Opens; Pittsburgh, New Castle & Lake Erie Railroad built through Mars; WH Walters & WJ Gilliand-General Store |
| 1879 | JB Dickey-General Store |
| 1880 | Adams population 1,156 |
| 1882 | Post Office moved to Marshall-Glliand Store |
| 1883 | S & A Thompson Store; T Marshall Store & Depot; S Roseboro-Grist Mill |
| 1884 | DB Wilson Store; FP Confer-Blacksmith |
| 1886 | Presley Duncan-Plasterer;HD Boyd -Lumber |
| 1887 | Mars has 50 residents;WH Theiker-Livery;Willer&Bratchie-Butchers |
| 1888 | Dr JC Barr-Pharmacy |
| 1890 | Adams Twp population 1,817 |
| 1891 | Fire on East RR Street |
| 1892 | JV Walters-Memorials;Mars Public School built on Crowe Ave |
| 1893 | Robert McElheny-Blacksmith;St. John's Old Peoples Home Built |
| 1894 | Mars incorporated as Boro; Trinity UP Church Est.;Sheridan& Norton-Machine Shop & Blacksmith;WD Boyd-Dry Goods;JE Graham-General Stock;Irvine Bros.-Furniture;WJ Link-Coal;JD Marshall-General Stock;TH Wiles-Restaurant |
| 1895 | Jordan&Co-General Stock; AC Zeigler-General Stock; WL Shannon-Grocer; David Roberts-Livery; TE Kerr-Grocer; Buzzard-Blacksmith; J Clark-Lumber; A Ziegler-Hardware |
| 1896 | Stewart Building |
| 1897 | Zeigler Building; JM Brown-Insurance & News; Robinson Oil Co; WJ Kennedy-Hardware; AC Zeigler-Shoe & Post Office |
| 1899 | Eight rooms of Mars School used for first time; C Zeigler-Tinning; Winter Low temp of -29 |
| 1900 | C Gelbach-Mars Milling & Feed; P Kerr-Pharmacy; C Feil-Watch & Clock Repair; Oil Well Supply; Rippley-Blacksmith; Mars National Bank; Sipes-Blacksmith |
| 1901 | Troutman Gas laid lines for homes & streetlights; JP Miller-Meats |
| 1902 | JA Crisswell-Undertaking & Furniture; W Groom-Carriage Mfg; L Clay-Restaurant |
| 1903 | Peter's Block; C & WJ Kennedy-Hardware; H Eber-Dry Goods |
| 1904 | Street Cars permitted; G Knaell-Meats; Zeigler & Schwab -Shoes |
| 1905 | Mars Fire Dept organized; St. John's Orphan Home; Municipal Water system est.; C Williters-Pharmacy; F Fleishner-Shoe Repair; Robinson Hotel; AT Marburger-Meats; A Vecharella-Fruits & Shoe Repair; WH Walters-Livery |
| 1906 | W Harris-Livery; D Walters-Undertaking; S Hichney-Restaurant |
| 1907 | North Pittsburgh Telephone installs lines; L Nauhaus-Cigars |
| 1908 | Velte Foundry; Survey of Streets & Sewer elevations |
| 1909 | Mars Post Office burns; C Andrews publishes a few issues of a newspaper; H Lloyd-Barber; L Link-Bowling Alley; W Link-Restaurant |
| 1910 | Sewer System est.;Treesdale Farms; C Wise-Grocer; Morrison-Florist; I McCandless-Barber; Irwin Millaneray |
| 1911 | Sewer System completed; Link & Kearns-Grocer; Davis-Shoemaker; Jordan Bros. |
| 1912 | Mars Light Co organized; AW McDonald-Undertaking & Livery; H Haule-Bowling Alley; H Groom-Blacksmith |
| 1913 | Garfield Lodge Order of Orangemen; RJ McGary-Pharmacy; Mrs. F. Conley-Harness Shop; WJ Kennedy-Feed; S Roberts-Boiler Repair; Craig Hardware; Mars High fields first baseball & football teams |
| 1914 | J Wiles-Bowling Alley; Morris & Eber-Dry Goods |
| 1915 | L Groom-Tanning & Roofing; P Boyd-Moving Pictures; JT Hutchman-General Hauling; Kearns & Humes-Ford Agency |
| 1916 | Church of God of Prophecy; Wynne & Starr-Bricks; L Nauhaus-grocer |
| 1917 | First catholic Mass; Schmuckler & Simon-Scrap;Fowler Lumber; Cottage Hotel; Gasoline Supply Co.; JT Shannafelt-lawyer; |
| 1918 | Mars High School built on Crowe Ave; Shannafelt-grocer; Covert's Lunch Counter & Pool Room; |
| 1919 | Staff& Weissert-Hardware; W Woods-barber |
| 1920 | N Berkibile-Barber; G Wallace-Harness Shop; CH Penny-Feed Supply; St. Killian Catholic Church |
| 1921 | Purvis garage; WB Marshall-Boiler Shop; Transcontinental Oil; M Fair-restaurant; Fullerton & Son-Lighting Fixtures; Plunhards-Tailor; Ziegler Place & Pool Hall; FV Pinkerton-Insurance; Jordan Bros-Real Estate & Insurance; Stauffer's Drug Store |
| 1922 | W Kramer-Meats; Mars Auto Shop; Mars Auto Garage; DR Johnson-Insruance; Mars Fruit Store; GH Baker-hardware; GS Dickson-Gen Merchandise |
| 1923 | Girl Scout Troop Est.; Four boys drown in Breakneck creek; CP Ewing-paperer & painter; |
Taken from 1976/77 Calendar published by the Triple M Class of the Mars UP Church and other sources
Last Update 10 Jul 1997