<Table> <Tr> <Th colspan="2"> Season </Th> <Th colspan="2"> Episodes </Th> <Th colspan="2"> Originally aired </Th> <Th colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Average viewers ( in millions ) </Th> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 10 , 2012 ( 2012 - 10 - 10 ) </Td> <Td> May 15 , 2013 ( 2013 - 05 - 15 ) </Td> <Td> 130 </Td> <Td> 3.68 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 9 , 2013 ( 2013 - 10 - 09 ) </Td> <Td> May 14 , 2014 ( 2014 - 05 - 14 ) </Td> <Td> 128 </Td> <Td> 3.28 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 8 , 2014 ( 2014 - 10 - 08 ) </Td> <Td> May 13 , 2015 ( 2015 - 05 - 13 ) </Td> <Td> 135 </Td> <Td> 3.52 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 7 , 2015 ( 2015 - 10 - 07 ) </Td> <Td> May 25 , 2016 ( 2016 - 05 - 25 ) </Td> <Td> 145 </Td> <Td> 2.90 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> 5 </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 5 , 2016 ( 2016 - 10 - 05 ) </Td> <Td> May 24 , 2017 ( 2017 - 05 - 24 ) </Td> <Td> 147 </Td> <Td> 2.21 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> 6 </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 12 , 2017 ( 2017 - 10 - 12 ) </Td> <Td> May 17 , 2018 ( 2018 - 05 - 17 ) </Td> <Td> 181 </Td> <Td> 1.76 </Td> </Tr> </Table>
<Table> <Tr> <Th colspan="2"> Season </Th> <Th colspan="2"> Episodes </Th> <Th colspan="2"> Originally aired </Th> <Th colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Average viewers ( in millions ) </Th> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 10 , 2012 ( 2012 - 10 - 10 ) </Td> <Td> May 15 , 2013 ( 2013 - 05 - 15 ) </Td> <Td> 130 </Td> <Td> 3.68 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 9 , 2013 ( 2013 - 10 - 09 ) </Td> <Td> May 14 , 2014 ( 2014 - 05 - 14 ) </Td> <Td> 128 </Td> <Td> 3.28 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 8 , 2014 ( 2014 - 10 - 08 ) </Td> <Td> May 13 , 2015 ( 2015 - 05 - 13 ) </Td> <Td> 135 </Td> <Td> 3.52 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 7 , 2015 ( 2015 - 10 - 07 ) </Td> <Td> May 25 , 2016 ( 2016 - 05 - 25 ) </Td> <Td> 145 </Td> <Td> 2.90 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> 5 </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 5 , 2016 ( 2016 - 10 - 05 ) </Td> <Td> May 24 , 2017 ( 2017 - 05 - 24 ) </Td> <Td> 147 </Td> <Td> 2.21 </Td> </Tr> <Tr> <Td> </Td> <Td colspan="1"> 6 </Td> <Td colspan="2"> 23 </Td> <Td colspan="1"> October 12 , 2017 ( 2017 - 10 - 12 ) </Td> <Td> May 17 , 2018 ( 2018 - 05 - 17 ) </Td> <Td> 181 </Td> <Td> 1.76 </Td> </Tr> </Table>
how many episodes in each season of arrow
how many episodes in each season of arrow
23
23