I have downloaded ChIP-Seq data and managed to get to a point where I have a long list of chromosome positions and some expression data. My question is, how to map these chromosome locations to HUGO gene symbols?

An example of my data is:

Peak                     GSM365925_ER_minus_ligand_align.bed     GSM365926_ER_E2_align.bed
chr20:257411-257873|     7                                       49
chr20:363265-363667|     0                                       98
chr20:373762-374404|     3                                       170
chr20:549324-550256|     1                                       23