This is the 4562nd most frequent Polish word.
listach
"Listach" is the locative plural form of "list," meaning "letters" or "leaves" in English, depending on the context.
The word 'listach' is used here in the context of 'listy mailingowe' (mailing lists), in the locative case to indicate location.
Na listach mailingowych znajdują się adresy klientów.
On the mailing lists, there are customers' addresses.
'Listach' is used to refer to 'listy wyborcze' (electoral lists), in locative case, meaning it’s being checked within those lists.
Sprawdziłem swoje nazwisko na listach wyborczych.
I checked my name on the electoral rolls.
Similarly, 'listach' used with 'listy wyników' (results lists), is in its locative form indicating location or occurrence within the lists.