  The asymptotic symmetries of electromagnetism in all higher spacetime
dimensions $d>4$ are extended, by incorporating consistently angle-dependent
$u(1)$ gauge transformations with a linear growth in the radial coordinate at
spatial infinity. Finiteness of the symplectic structure and preservation of
the asymptotic conditions require to impose a set of strict parity conditions,
under the antipodal map of the $(d-2)$-sphere, on the leading order fields at
infinity. Canonical generators of the asymptotic symmetries are obtained
through standard Hamiltonian methods. Remarkably, the theory endowed with this
set of asymptotic conditions turns out to be invariant under a six-fold set of
angle-dependent $u(1)$ transformations, whose generators form a centrally
extended abelian algebra. The new charges generated by the $\mathcal O(r)$
gauge parameter are found to be conjugate to those associated to the now
improper subleading $O(r^{-d+3})$ transformations, while the standard $\mathcal
O(1)$ gauge transformations are canonically conjugate to the subleading
$\mathcal{O}(r^{-d+4})$ transformations. This algebraic structure,
characterized by the presence of central charges, allows us to perform a
nonlinear redefinition of the Poincar\'e generators, that results in the
decoupling of all of the $u(1)$ charges from the Poincar\'e algebra. Thus, the
mechanism previously used in $d=4$ to find gauge-invariant Poincar\'e
generators is shown to be a robust property of electromagnetism in all
spacetime dimensions $d\geq 4$.
