ZIP 10543: $18.4 million across 25,078 FEC lines

A Westchester ZIP with dollars packed into fewer rows

$18,447,133 divided by 25,078 is about $736 per itemized line. That is a high-mean pattern: fewer Schedule A rows than an $18 million university-town ZIP, more dollars on the typical row. Sound Shore geography does not change the arithmetic. The packet publishes a dollar total and a contribution count. It does not publish a unique-donor count or a party split.

Twenty-five thousand seventy-eight contributions is still a long list by ordinary filing standards. It is not a headcount of Mamaroneck households. Repeat gifts, spouse filings, and redesignations can add rows. Because this packet has no donor figure, 25,078 must be cited as a contribution-line total.

LobbyVault does not treat $18,447,133 as a ranking of Westchester civic virtue. Motive language is out of scope. The source is FEC.gov itemized receipts tagged 10543.

Village mail codes and federal forms

10543 is the ZIP most filers use for Mamaroneck. A committee that lists a Larchmont-adjacent suite, a joint fundraising committee, or a household that files 10543 all post the same five-digit key. $18,447,133 follows the form. It is not a resident-only book.

The 25,078-line count can include memo entries. Open the ZIP 10543 FEC page for named receipts. This guide will not guess which rows are households.

What the $18,447,133 total excludes

Unitemized federal gifts are omitted. New York State office campaigns are omitted. Independent expenditures paid from another ZIP are omitted even if they mention a Westchester race. Cite $18,447,133 only as itemized federal receipts tagged 10543.

Because the line list is shorter than high-volume coastal ZIPs, a handful of large restated transfers can move the headline more. Recheck the live hub after quarterly filings. This prose is a snapshot of FEC.gov aggregates indexed on LobbyVault.

A contributor who gives twice is two lines. Subtracting duplicates without a documented match key would manufacture a total other than $18,447,133. Leave 25,078 as a contribution-line count.

Mamaroneck village limits and the 10543 mail key are not the same polygon. Filers in adjoining Sound Shore streets may use a different five-digit code even when the school or harbor is shared. $18,447,133 is 10543 only. Keep 25,078 as the contribution-line total. Do not treat the high mean of about $736 as a median household figure; this packet has no median.

Westchester state-committee money never enters this federal ZIP roll-up. Independent expenditures paid from Manhattan never enter unless the contributor ZIP on a receipt is 10543. Recheck the ZIP 10543 FEC page after large filings. The donor directory lists names across ZIPs. Filtering it to 10543 should reconcile to the hub. FEC.gov controls if a later extract disagrees.

10543 beside other Sound Shore codes

The all-ZIP directory ranks the same series. Nearby Larchmont, Rye, and New Rochelle codes often show different means. Compare 25,078 against those peers rather than against a Seattle ZIP with 80,000 lines. Filing shape is local to how addresses were entered.

Stacking Mamaroneck with the rest of Westchester is a common recode. This page does not perform it. $18,447,133 is the 10543 key only. If you build a county total, list every ZIP you included and do not call the sum an FEC publication.

How to use the three LobbyVault tables

The ZIP 10543 FEC page holds $18,447,133 and 25,078 as currently indexed. The all-ZIP directory places the code among others. The donor directory lists names on itemized receipts. If a later extract disagrees, FEC.gov controls.

Filtering the donor directory to 10543 should reconcile to the ZIP hub, not to a homemade $736 average. When a name search and 25,078 disagree, the ZIP roll-up is the geographic total. No income map is attached to this figure.

High mean, short list: how to cite 10543

Mamaroneck’s 10543 key posts $18,447,133 across 25,078 contributions, a mean near $736. That shape is easy to over-read as “richer donors.” It is only fewer lines and more dollars per line. A handful of large transfers can raise a mean without describing the median household. This packet has no median, no unique-donor count, and no income map.

Westchester has many five-digit keys. Rye, Larchmont, and New Rochelle are not 10543. Stacking them produces a county figure FEC.gov did not publish. If you build that figure, list every ZIP. Keep 25,078 as the 10543 line count. The all-ZIP directory is the inventory.

New York State office money never enters $18,447,133. Unitemized federal gifts never enter. Because the list is shorter than a high-volume coastal ZIP, a restated joint-fundraising block can move the headline more. Recheck the ZIP 10543 FEC page after quarterly filings. The donor directory lists names; it is not a second copy of $18,447,133.

Questions

How much federal campaign money is tied to ZIP 10543?

FEC.gov itemized receipts listing contributor ZIP 10543 total $18,447,133 across 25,078 contributions in the LobbyVault aggregate. That figure is a ZIP roll-up of federal Schedule A rows, not a unique-donor count and not a census of Mamaroneck residents. Unitemized gifts sit outside it. The mean of about $736 is arithmetic from those two packet facts.

How many FEC contributions are tagged to ZIP 10543?

LobbyVault counts 25,078 itemized contributions for ZIP 10543. That is a line count, not a headcount of unique people. Repeat gifts and memo entries can add rows without adding new donors. This packet does not publish a unique-donor figure. The matching dollar total on the same extract is $18,447,133.

Does ZIP 10543 include only Mamaroneck residents?

No. The ZIP is the five-digit contributor code on the FEC itemization. Committees and office addresses that file 10543 can be part of $18,447,133 when that is what was entered. LobbyVault does not recode the field into a residential-only book. Open named receipts on the ZIP hub to see which committees appear.

Where does LobbyVault get ZIP 10543 totals?

The numbers come from FEC.gov itemized contribution aggregates indexed on LobbyVault: $18,447,133 and 25,078 lines for ZIP 10543. Original reports remain on FEC.gov. Unitemized federal gifts and New York State filings are outside both figures. If a later extract disagrees with this snapshot, the Commission’s filing controls.