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I live in northern Illinois and had these guys appearing in my room. No facial markings and they seem non agressive.

About 2cm in length with off white u shaped markings below it's waist and a single white line a few segments down.

enter image description here

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It looks to me as Potter Wasp (or mason wasps), the Eumeninae, are a cosmopolitan wasp group presently treated as a subfamily of Vespidae, but sometimes recognized in the past as a separate family, Eumenidae.

Since there is no more info provided and image is not sharp I cannot be 100% sure.

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  • $\begingroup$ The post displays info about its size now which was previously hidden due to improper usage of markdown. $\endgroup$ – Tyto alba Jun 16 '17 at 11:16
  • $\begingroup$ The online Canadian Journal of Arthropod Identification has an issue covering the Vespidae of northeastern North America (PDF available here: biologicalsurvey.ca/ejournal/bmc_05/pdf/bmc05.pdf), with Illinois as a limital point; if you have a stereoscope available and are willing to take a specimen (freezing will work, if you don't want to use poisons), you will get a species name from that work. $\endgroup$ – Arthur J Frost Jun 19 '17 at 14:59

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