Hello Shelly, the diocese of Armagh is made up of the counties of Armagh and Louth, Inniskeen parish is in both Louth and Monaghan. see https://registers.nli.ie/ Look at the maps section. Most towns would have a market and the biggest town would be Dundalk but Carlingford also would have a market, if you are on a subscription site you could look at the newspaper advertisements etc
You do not mention names or years, assuming the marriage took place in Lordship as the brides parish it is possible they met if she worked in a big house locally to Louth or Monaghan etc, Lordship is in the Cooley Peninsula (the US President Elect traces his maternal ancestry to nearby Whitestown) there is a website here containing lots of old photos of the people of the area, https://www.carlingfordpeople.ie/ and a site on Louth history here http://www.jbhall.clahs.ie/
There are also a number of Facebook pages on Louth genealogy and a number doing local photos like Dundalk Northend plus a number starting with Cooley etc
Happy New Year
Pat