If you used the standard deduction (did not itemize) the year you got a state refund, then you do not need to report your state refund as income.
https://www.irs.gov/faqs/interest-dividends-other-types-of-income/1099-information-returns-all-other...
See also:https://support.taxslayer.com/hc/en-us/articles/360015713672-1099-G-General-Information-About-State-...
