http://www.uk-family-history.com/1841-census.html#What%20places%20are%20missing I think that it may be missing

Wales...
Denbigh – Clocaenog (including townships Isa and Ucha), Derwen (including townships Derwen-Dyfanedd and Derwen-Ysgeifiog), Llanelidan (including townships Bryncume, Garthyneuvedd, Llan, Nantclwyd and Trewyn-Bodlowydd), Llanfair-Dyffrin-Clwyd (including townships Derwen-Llanerch, Euarth, Faynol and Garthgynan),
Llanaron (including townships of Alltgymbyd, Benhadlen, Bodidris& Bodidris Truam, Bodigre’r-Abbot, Bodigre’r-Yarll, Creiogiog-Is-Glan, Creigiog-Uwch-Glan, Chwyleiriog, Cyfnant, Erryrys, Gelligynnan, Gwaenyffymon, Llan).Flint – Bangor (part missing, including Bangor township – rest is missing from Bromfield Hundred, Denbs), Erbistock (part missing – rest missing from Bromfield Hundred, Denbs), Hope, or Estyn (including townships Caergwyrle, Cymmau, Estyn, Hope Owen, Rhanberfedd, Shordley, Isaf Uwch-y-Mynydd, Uchaf Uwch-y-Mynydd),
Llanarmon (part missing, including township Bodidris – rest missing from Yale Hundred Denbs), Threapwood (part missing – rest missing from Broxton Hundred, Cheshire), Worthenbury, Wrexham (part missing, including township Abenbury Fechan – rest missing from Bromfield Hundred, Denbs).