sentences:  Just as telephone company exchange areas do not correspond with municipal boundaries, not all areas of a large municipality may enjoy the same EAS area (the Lambeth exchange serving part of London, Ontario, does not have as many exchanges in its EAS area as the London exchange area).EAS across an international border is rare, and is usually a relic of former common-ownership or a single exchange serving both communities.Surviving examples include Sweet Grass, MT - Coutts, AB (separate exchanges on the border); Stewart, BC - Hyder, AK (Hyder served by Stewart exchange); Estcourt Station, QC - Estcourt, ME (served by Estcourt Station exchange).