/usr/lib/locale/es_US/ is in locales-all 2.24-11+deb9u4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/locale/es_US.utf8/LC_ADDRESS
/usr/lib/locale/es_US.utf8/LC_COLLATE
/usr/lib/locale/es_US.utf8/LC_CTYPE
/usr/lib/locale/es_US.utf8/LC_IDENTIFICATION
/usr/lib/locale/es_US.utf8/LC_MEASUREMENT
/usr/lib/locale/es_US.utf8/LC_MESSAGES/
/usr/lib/locale/es_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES
/usr/lib/locale/es_US.utf8/LC_MONETARY
/usr/lib/locale/es_US.utf8/LC_NAME
/usr/lib/locale/es_US.utf8/LC_NUMERIC
/usr/lib/locale/es_US.utf8/LC_PAPER
/usr/lib/locale/es_US.utf8/LC_TELEPHONE
/usr/lib/locale/es_US.utf8/LC_TIME
/usr/lib/locale/es_US/LC_ADDRESS
/usr/lib/locale/es_US/LC_COLLATE
/usr/lib/locale/es_US/LC_CTYPE
/usr/lib/locale/es_US/LC_IDENTIFICATION
/usr/lib/locale/es_US/LC_MEASUREMENT
/usr/lib/locale/es_US/LC_MESSAGES/
/usr/lib/locale/es_US/LC_MESSAGES/SYS_LC_MESSAGES
/usr/lib/locale/es_US/LC_MONETARY
/usr/lib/locale/es_US/LC_NAME
/usr/lib/locale/es_US/LC_NUMERIC
/usr/lib/locale/es_US/LC_PAPER
/usr/lib/locale/es_US/LC_TELEPHONE
/usr/lib/locale/es_US/LC_TIME