The following information is about the Population & Steets of Markle City, Indiana. The population of Markle is approximately 1,164 residents, and the median household income is $48,409. The poverty rate in the city is also calculated. Although there is no official poverty rate, it is below the national average. Markle has a very low rate. It is estimated that there are around 26% of the population that live in poverty, which is lower than the state average.