. ▁Its ▁Post ▁Office ▁has ▁a ▁Z IP ▁Code ▁of ▁ 8 0 4 4 9 . ▁ ▁The ▁Z CT A ▁for ▁ 8 0 4 4 9 ▁had ▁a ▁population ▁of ▁ 6 7 7 ▁at ▁the ▁ 2 0 0 0 ▁census . ▁ ▁History ▁ ▁F ounded ▁in ▁ 1 8 8 0 , ▁Hart sel ▁is ▁close ▁to ▁the ▁ge ographic ▁center ▁of ▁the ▁state , ▁and ▁is ▁often ▁referred ▁to ▁as ▁" The ▁Heart ▁of ▁Colorado ". ▁The ▁names ake ▁of ▁the ▁community ▁is ▁Samuel ▁Hart sel , ▁a ▁local ▁cattle ▁ran cher ▁who ▁came ▁to ▁Park ▁County ▁in ▁ 1 8 6 0 ▁and ▁left ▁in ▁ 1 9 0 8 . ▁He ▁also ▁raised ▁p igs ▁and ▁sheep ▁and ▁grew ▁o ats , ▁whe at , ▁bar ley , ▁r ye , ▁and ▁hay ▁on ▁fifteen ▁thousand ▁acres . ▁He ▁developed ▁the ▁Hart sel ▁hot ▁spr ings ▁and ▁built ▁a ▁saw mill , ▁black sm ith ▁shop , ▁and ▁a ▁trad ing ▁post ▁to ▁lay ▁the ▁ground work ▁for ▁the ▁town . ▁ ▁Geography ▁Hart sel ▁is ▁located ▁at ▁ ▁( 3 9 . 0 2 1 3 1 8 , ▁- 1 0 5 . 7 9 5 7 6 5 ). ▁ ▁According ▁to ▁the ▁United ▁States ▁Census ▁Bureau ▁the ▁town ▁has ▁a ▁total ▁area ▁of ▁ 6 0 5 . 1 0 ▁square ▁miles ▁( 9 7 3 . 6 0   km 2 ), ▁ 6 0 1 . 1 8